21031213132 has 24 divisors (see below), whose sum is σ = 36994616064. Its totient is φ = 10461393552.

The previous prime is 21031213129. The next prime is 21031213139. The reversal of 21031213132 is 23131213012.

It is not an unprimeable number, because it can be changed into a prime (21031213139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1305873 + ... + 1321879.

It is an arithmetic number, because the mean of its divisors is an integer number (1541442336).

Almost surely, 2^21031213132 is an apocalyptic number.

It is an amenable number.

21031213132 is a deficient number, since it is larger than the sum of its proper divisors (15963402932).

21031213132 is a wasteful number, since it uses less digits than its factorization.

21031213132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17685 (or 17683 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21031213132 its reverse (23131213012), we get a palindrome (44162426144).

The spelling of 21031213132 in words is "twenty-one billion, thirty-one million, two hundred thirteen thousand, one hundred thirty-two".