Search a number
-
+
21000120000 = 263541391259
BaseRepresentation
bin10011100011101101…
…000110011011000000
32000012112102121222020
4103203231012123000
5321002012320000
613351453241440
71342255034436
oct234355063300
960175377866
1021000120000
1189a7024a82
1240a0a93280
131c98957612
141033064d56
1582d972ba0
hex4e3b466c0

21000120000 has 280 divisors, whose sum is σ = 69986347200. Its totient is φ = 5555328000.

The previous prime is 21000119999. The next prime is 21000120013. The reversal of 21000120000 is 2100012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (6).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 16679371 + ... + 16680629.

It is an arithmetic number, because the mean of its divisors is an integer number (249951240).

Almost surely, 221000120000 is an apocalyptic number.

21000120000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21000120000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34993173600).

21000120000 is an abundant number, since it is smaller than the sum of its proper divisors (48986227200).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21000120000 is a wasteful number, since it uses less digits than its factorization.

21000120000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1433 (or 1408 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 6.

Adding to 21000120000 its reverse (2100012), we get a palindrome (21002220012).

21000120000 divided by its reverse (2100012) gives a 4-th power (10000 = 104).

The spelling of 21000120000 in words is "twenty-one billion, one hundred twenty thousand".