21201211110120 has 32 divisors (see below), whose sum is σ = 63603633330720. Its totient is φ = 5653656296000.

The previous prime is 21201211110071. The next prime is 21201211110161. The reversal of 21201211110120 is 2101111210212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21201211110120.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88338379506 + ... + 88338379745.

It is an arithmetic number, because the mean of its divisors is an integer number (1987613541585).

Almost surely, 2^{21201211110120} is an apocalyptic number.

21201211110120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21201211110120 is an abundant number, since it is smaller than the sum of its proper divisors (42402422220600).

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

21201211110120 is a wasteful number, since it uses less digits than its factorization.

21201211110120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176676759265 (or 176676759261 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21201211110120 its reverse (2101111210212), we get a palindrome (23302322320332).

The spelling of 21201211110120 in words is "twenty-one trillion, two hundred one billion, two hundred eleven million, one hundred ten thousand, one hundred twenty".