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21112021000 = 2353719181877
BaseRepresentation
bin10011101010010111…
…111110000000001000
32000111022222210021201
4103222113332000020
5321214134133000
613410531513544
71345114134430
oct235227760010
960438883251
1021112021000
118a54204944
1241124588b4
131cb5ba7025
141043c732c0
158386c896a
hex4ea5fe008

21112021000 has 256 divisors, whose sum is σ = 59827622400. Its totient is φ = 6811776000.

The previous prime is 21112020971. The next prime is 21112021033. The reversal of 21112021000 is 12021112.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 24072562 + ... + 24073438.

It is an arithmetic number, because the mean of its divisors is an integer number (233701650).

Almost surely, 221112021000 is an apocalyptic number.

21112021000 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 21112021000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29913811200).

21112021000 is an abundant number, since it is smaller than the sum of its proper divisors (38715601400).

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

21112021000 is a wasteful number, since it uses less digits than its factorization.

21112021000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1105 (or 1091 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21112021000 its reverse (12021112), we get a palindrome (21124042112).

The spelling of 21112021000 in words is "twenty-one billion, one hundred twelve million, twenty-one thousand".