21210022120 has 96 divisors (see below), whose sum is σ = 57937236480. Its totient is φ = 6844216320.

The previous prime is 21210022111. The next prime is 21210022151. The reversal of 21210022120 is 2122001212.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21210022120.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 50136 + ... + 211975.

It is an arithmetic number, because the mean of its divisors is an integer number (603512880).

Almost surely, 2^21210022120 is an apocalyptic number.

21210022120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21210022120 is an abundant number, since it is smaller than the sum of its proper divisors (36727214360).

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

21210022120 is a wasteful number, since it uses less digits than its factorization.

21210022120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262163 (or 262142 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21210022120 its reverse (2122001212), we get a palindrome (23332023332).

The spelling of 21210022120 in words is "twenty-one billion, two hundred ten million, twenty-two thousand, one hundred twenty".