21031303272 has 64 divisors (see below), whose sum is σ = 60146582400. Its totient is φ = 6003229440.

The previous prime is 21031303229. The next prime is 21031303273. The reversal of 21031303272 is 27230313012.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (21031303273) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 119254 + ... + 237242.

It is an arithmetic number, because the mean of its divisors is an integer number (939790350).

Almost surely, 2^21031303272 is an apocalyptic number.

It is an amenable number.

21031303272 is an abundant number, since it is smaller than the sum of its proper divisors (39115279128).

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

21031303272 is a wasteful number, since it uses less digits than its factorization.

21031303272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119066 (or 119062 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 24.

Adding to 21031303272 its reverse (27230313012), we get a palindrome (48261616284).

The spelling of 21031303272 in words is "twenty-one billion, thirty-one million, three hundred three thousand, two hundred seventy-two".