21213231212 has 6 divisors (see below), whose sum is σ = 37123154628. Its totient is φ = 10606615604.

The previous prime is 21213231209. The next prime is 21213231233.

21213231212 is nontrivially palindromic in base 10.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2651653898 + ... + 2651653905.

It is an arithmetic number, because the mean of its divisors is an integer number (6187192438).

Almost surely, 2^21213231212 is an apocalyptic number.

It is an amenable number.

21213231212 is a deficient number, since it is larger than the sum of its proper divisors (15909923416).

21213231212 is a wasteful number, since it uses less digits than its factorization.

21213231212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5303307807 (or 5303307805 counting only the distinct ones).

The product of its digits is 288, while the sum is 20.

The spelling of 21213231212 in words is "twenty-one billion, two hundred thirteen million, two hundred thirty-one thousand, two hundred twelve".