21211232312 has 32 divisors (see below), whose sum is σ = 42255561600. Its totient is φ = 9953517024.

The previous prime is 21211232309. The next prime is 21211232323. The reversal of 21211232312 is 21323211212.

It is a congruent number.

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, 635828 + ... + 668355.

It is an arithmetic number, because the mean of its divisors is an integer number (1320486300).

Almost surely, 2^21211232312 is an apocalyptic number.

It is an amenable number.

21211232312 is a deficient number, since it is larger than the sum of its proper divisors (21044329288).

21211232312 is a wasteful number, since it uses less digits than its factorization.

21211232312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1304315 (or 1304311 counting only the distinct ones).

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

Adding to 21211232312 its reverse (21323211212), we get a palindrome (42534443524).

The spelling of 21211232312 in words is "twenty-one billion, two hundred eleven million, two hundred thirty-two thousand, three hundred twelve".