21213831212 has 24 divisors (see below), whose sum is σ = 42511045920. Its totient is φ = 9073774080.

The previous prime is 21213831203. The next prime is 21213831229.

21213831212 is nontrivially palindromic in base 10.

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, 729989 + ... + 758492.

It is an arithmetic number, because the mean of its divisors is an integer number (1771293580).

Almost surely, 2^21213831212 is an apocalyptic number.

It is an amenable number.

21213831212 is an abundant number, since it is smaller than the sum of its proper divisors (21297214708).

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

21213831212 is a wasteful number, since it uses less digits than its factorization.

21213831212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1489001 (or 1488999 counting only the distinct ones).

The product of its digits is 1152, while the sum is 26.

The spelling of 21213831212 in words is "twenty-one billion, two hundred thirteen million, eight hundred thirty-one thousand, two hundred twelve".