21210121011212 has 24 divisors (see below), whose sum is σ = 42420639072000. Its totient is φ = 9089966779920.

The previous prime is 21210121011187. The next prime is 21210121011217. The reversal of 21210121011212 is 21211012101212.

21210121011212 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (21210121011217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 452864 + ... + 6528807.

It is an arithmetic number, because the mean of its divisors is an integer number (1767526628000).

Almost surely, 2^{21210121011212} is an apocalyptic number.

It is an amenable number.

21210121011212 is an abundant number, since it is smaller than the sum of its proper divisors (21210518060788).

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

21210121011212 is a wasteful number, since it uses less digits than its factorization.

21210121011212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7090181 (or 7090179 counting only the distinct ones).

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

Adding to 21210121011212 its reverse (21211012101212), we get a palindrome (42421133112424).

The spelling of 21210121011212 in words is "twenty-one trillion, two hundred ten billion, one hundred twenty-one million, eleven thousand, two hundred twelve".