21120122212210 has 192 divisors, whose sum is σ = 50878707655680. Its totient is φ = 6248259440640.

The previous prime is 21120122212199. The next prime is 21120122212337. The reversal of 21120122212210 is 1221222102112.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2754054 + ... + 7058686.

It is an arithmetic number, because the mean of its divisors is an integer number (264993269040).

Almost surely, 2^{21120122212210} is an apocalyptic number.

21120122212210 is an abundant number, since it is smaller than the sum of its proper divisors (29758585443470).

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

21120122212210 is a wasteful number, since it uses less digits than its factorization.

21120122212210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4304721 (or 4304714 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21120122212210 its reverse (1221222102112), we get a palindrome (22341344314322).

The spelling of 21120122212210 in words is "twenty-one trillion, one hundred twenty billion, one hundred twenty-two million, two hundred twelve thousand, two hundred ten".