21112331272 has 16 divisors (see below), whose sum is σ = 39608946000. Its totient is φ = 10549945680.

The previous prime is 21112331147. The next prime is 21112331291. The reversal of 21112331272 is 27213321112.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 763054 + ... + 790237.

It is an arithmetic number, because the mean of its divisors is an integer number (2475559125).

Almost surely, 2^21112331272 is an apocalyptic number.

It is an amenable number.

21112331272 is a deficient number, since it is larger than the sum of its proper divisors (18496614728).

21112331272 is a wasteful number, since it uses less digits than its factorization.

21112331272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1554996 (or 1554992 counting only the distinct ones).

The product of its digits is 1008, while the sum is 25.

Adding to 21112331272 its reverse (27213321112), we get a palindrome (48325652384).

The spelling of 21112331272 in words is "twenty-one billion, one hundred twelve million, three hundred thirty-one thousand, two hundred seventy-two".