21101011211200 has 84 divisors (see below), whose sum is σ = 54975892000752. Its totient is φ = 7943910092800.

The previous prime is 21101011211191. The next prime is 21101011211261. The reversal of 21101011211200 is 211211010112.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 387859036 + ... + 387913435.

Almost surely, 2^{21101011211200} is an apocalyptic number.

21101011211200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21101011211200 is an abundant number, since it is smaller than the sum of its proper divisors (33874880789552).

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

21101011211200 is a wasteful number, since it uses less digits than its factorization.

21101011211200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 775772510 (or 775772495 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21101011211200 its reverse (211211010112), we get a palindrome (21312222221312).

The spelling of 21101011211200 in words is "twenty-one trillion, one hundred one billion, eleven million, two hundred eleven thousand, two hundred".