21020311233212 has 48 divisors (see below), whose sum is σ = 38120210472960. Its totient is φ = 10135064302272.

The previous prime is 21020311233191. The next prime is 21020311233221. The reversal of 21020311233212 is 21233211302012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 223842533 + ... + 223936419.

It is an arithmetic number, because the mean of its divisors is an integer number (794171051520).

Almost surely, 2^{21020311233212} is an apocalyptic number.

It is an amenable number.

21020311233212 is a deficient number, since it is larger than the sum of its proper divisors (17099899239748).

21020311233212 is a wasteful number, since it uses less digits than its factorization.

21020311233212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110490 (or 110488 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 21020311233212 its reverse (21233211302012), we get a palindrome (42253522535224).

The spelling of 21020311233212 in words is "twenty-one trillion, twenty billion, three hundred eleven million, two hundred thirty-three thousand, two hundred twelve".