21123310132012 has 24 divisors (see below), whose sum is σ = 40326439668480. Its totient is φ = 9601475956560.

The previous prime is 21123310132007. The next prime is 21123310132013. The reversal of 21123310132012 is 21023101332112.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (21123310132013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23084113 + ... + 23981719.

It is an arithmetic number, because the mean of its divisors is an integer number (1680268319520).

Almost surely, 2^{21123310132012} is an apocalyptic number.

21123310132012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21123310132012 is a deficient number, since it is larger than the sum of its proper divisors (19203129536468).

21123310132012 is a wasteful number, since it uses less digits than its factorization.

21123310132012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1432461 (or 1432459 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 21123310132012 its reverse (21023101332112), we get a palindrome (42146411464124).

The spelling of 21123310132012 in words is "twenty-one trillion, one hundred twenty-three billion, three hundred ten million, one hundred thirty-two thousand, twelve".