21210011022120 has 64 divisors (see below), whose sum is σ = 63631192896000. Its totient is φ = 5655899843328.

The previous prime is 21210011022091. The next prime is 21210011022127. The reversal of 21210011022120 is 2122011001212.

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 21210011022120.

It is not an unprimeable number, because it can be changed into a prime (21210011022127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5116521 + ... + 8282439.

It is an arithmetic number, because the mean of its divisors is an integer number (994237389000).

Almost surely, 2^{21210011022120} is an apocalyptic number.

21210011022120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21210011022120 is an abundant number, since it is smaller than the sum of its proper divisors (42421181873880).

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

21210011022120 is a wasteful number, since it uses less digits than its factorization.

21210011022120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3221762 (or 3221758 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21210011022120 its reverse (2122011001212), we get a palindrome (23332022023332).

The spelling of 21210011022120 in words is "twenty-one trillion, two hundred ten billion, eleven million, twenty-two thousand, one hundred twenty".