20100021001200 has 180 divisors, whose sum is σ = 79717321486608. Its totient is φ = 4594290508800.

The previous prime is 20100021001187. The next prime is 20100021001201. The reversal of 20100021001200 is 210012000102.

It is a tau number, because it is divible by the number of its divisors (180).

It is a super-3 number, since 3×20100021001200³ (a number of 41 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20100021001201) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 398784741 + ... + 398835140.

Almost surely, 2^{20100021001200} is an apocalyptic number.

20100021001200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20100021001200 is an abundant number, since it is smaller than the sum of its proper divisors (59617300485408).

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

20100021001200 is a wasteful number, since it uses less digits than its factorization.

20100021001200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 797619912 (or 797619898 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 20100021001200 its reverse (210012000102), we get a palindrome (20310033001302).

The spelling of 20100021001200 in words is "twenty trillion, one hundred billion, twenty-one million, one thousand, two hundred".