21121112021210 has 16 divisors (see below), whose sum is σ = 38735322424776. Its totient is φ = 8289040189248.

The previous prime is 21121112021129. The next prime is 21121112021231. The reversal of 21121112021210 is 1212021112112.

It can be written as a sum of positive squares in 4 ways, for example, as 21120945637009 + 166384201 = 4595753^2 + 12899^2 .

It is a super-2 number, since 2×21121112021210² (a number of 27 digits) contains 22 as substring.

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, 19925576849 + ... + 19925577908.

Almost surely, 2^{21121112021210} is an apocalyptic number.

21121112021210 is a deficient number, since it is larger than the sum of its proper divisors (17614210403566).

21121112021210 is a wasteful number, since it uses less digits than its factorization.

21121112021210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39851154817.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21121112021210 its reverse (1212021112112), we get a palindrome (22333133133322).

The spelling of 21121112021210 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred twelve million, twenty-one thousand, two hundred ten".