21310233212 has 24 divisors (see below), whose sum is σ = 38584576800. Its totient is φ = 10286177216.

The previous prime is 21310233181. The next prime is 21310233233. The reversal of 21310233212 is 21233201312.

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, 1460489 + ... + 1475007.

It is an arithmetic number, because the mean of its divisors is an integer number (1607690700).

Almost surely, 2^21310233212 is an apocalyptic number.

It is an amenable number.

21310233212 is a deficient number, since it is larger than the sum of its proper divisors (17274343588).

21310233212 is a wasteful number, since it uses less digits than its factorization.

21310233212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27205 (or 27203 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21310233212 its reverse (21233201312), we get a palindrome (42543434524).

The spelling of 21310233212 in words is "twenty-one billion, three hundred ten million, two hundred thirty-three thousand, two hundred twelve".