21000101211200 has 84 divisors (see below), whose sum is σ = 54393025386960. Its totient is φ = 7957933079040.

The previous prime is 21000101211179. The next prime is 21000101211209. The reversal of 21000101211200 is 211210100012.

It is not an unprimeable number, because it can be changed into a prime (21000101211209) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 345366002 + ... + 345426801.

Almost surely, 2^{21000101211200} is an apocalyptic number.

21000101211200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21000101211200 is an abundant number, since it is smaller than the sum of its proper divisors (33392924175760).

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

21000101211200 is a wasteful number, since it uses less digits than its factorization.

21000101211200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 690792844 (or 690792829 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21000101211200 its reverse (211210100012), we get a palindrome (21211311311212).

The spelling of 21000101211200 in words is "twenty-one trillion, one hundred one million, two hundred eleven thousand, two hundred".