21213431212 has 12 divisors (see below), whose sum is σ = 38403625680. Its totient is φ = 10240966736.

The previous prime is 21213431189. The next prime is 21213431219.

21213431212 is nontrivially palindromic in base 10.

It is not an unprimeable number, because it can be changed into a prime (21213431219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91437088 + ... + 91437319.

It is an arithmetic number, because the mean of its divisors is an integer number (3200302140).

Almost surely, 2^21213431212 is an apocalyptic number.

It is an amenable number.

21213431212 is a deficient number, since it is larger than the sum of its proper divisors (17190194468).

21213431212 is a wasteful number, since it uses less digits than its factorization.

21213431212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182874440 (or 182874438 counting only the distinct ones).

The product of its digits is 576, while the sum is 22.

The spelling of 21213431212 in words is "twenty-one billion, two hundred thirteen million, four hundred thirty-one thousand, two hundred twelve".