21121020211210 has 64 divisors (see below), whose sum is σ = 38707825508352. Its totient is φ = 8295902911296.

The previous prime is 21121020211157. The next prime is 21121020211211. The reversal of 21121020211210 is 1211202012112.

It is not an unprimeable number, because it can be changed into a prime (21121020211211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 473936389 + ... + 473980951.

It is an arithmetic number, because the mean of its divisors is an integer number (604809773568).

Almost surely, 2^{21121020211210} is an apocalyptic number.

21121020211210 is a deficient number, since it is larger than the sum of its proper divisors (17586805297142).

21121020211210 is a wasteful number, since it uses less digits than its factorization.

21121020211210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46867.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21121020211210 its reverse (1211202012112), we get a palindrome (22332222223322).

The spelling of 21121020211210 in words is "twenty-one trillion, one hundred twenty-one billion, twenty million, two hundred eleven thousand, two hundred ten".