21311233011212 has 24 divisors (see below), whose sum is σ = 39491308521504. Its totient is φ = 10028092397312.

The previous prime is 21311233011209. The next prime is 21311233011223. The reversal of 21311233011212 is 21211033211312.

It is a happy 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, 10348448 + ... + 12235719.

It is an arithmetic number, because the mean of its divisors is an integer number (1645471188396).

Almost surely, 2^{21311233011212} is an apocalyptic number.

It is an amenable number.

21311233011212 is a deficient number, since it is larger than the sum of its proper divisors (18180075510292).

21311233011212 is a wasteful number, since it uses less digits than its factorization.

21311233011212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22598065 (or 22598063 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 23.

Adding to 21311233011212 its reverse (21211033211312), we get a palindrome (42522266222524).

The spelling of 21311233011212 in words is "twenty-one trillion, three hundred eleven billion, two hundred thirty-three million, eleven thousand, two hundred twelve".