21031203132 has 72 divisors (see below), whose sum is σ = 59252029200. Its totient is φ = 6250756608.

The previous prime is 21031203131. The next prime is 21031203133. The reversal of 21031203132 is 23130213012.

It is an interprime number because it is at equal distance from previous prime (21031203131) and next prime (21031203133).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21031203131) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 892707 + ... + 915962.

It is an arithmetic number, because the mean of its divisors is an integer number (822944850).

Almost surely, 2^21031203132 is an apocalyptic number.

It is an amenable number.

21031203132 is an abundant number, since it is smaller than the sum of its proper divisors (38220826068).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21031203132 is a wasteful number, since it uses less digits than its factorization.

21031203132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1808715 (or 1808710 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21031203132 its reverse (23130213012), we get a palindrome (44161416144).

The spelling of 21031203132 in words is "twenty-one billion, thirty-one million, two hundred three thousand, one hundred thirty-two".