21121011121210 has 96 divisors (see below), whose sum is σ = 51956421535872. Its totient is φ = 6076774408320.

The previous prime is 21121011121169. The next prime is 21121011121213. The reversal of 21121011121210 is 1212111012112.

It is a super-2 number, since 2×21121011121210² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21121011121213) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 150643582 + ... + 150783721.

It is an arithmetic number, because the mean of its divisors is an integer number (541212724332).

Almost surely, 2^{21121011121210} is an apocalyptic number.

21121011121210 is an abundant number, since it is smaller than the sum of its proper divisors (30835410414662).

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

21121011121210 is a wasteful number, since it uses less digits than its factorization.

21121011121210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301427348 (or 301427341 counting only the distinct ones).

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

Adding to 21121011121210 its reverse (1212111012112), we get a palindrome (22333122133322).

The spelling of 21121011121210 in words is "twenty-one trillion, one hundred twenty-one billion, eleven million, one hundred twenty-one thousand, two hundred ten".