21031111332 has 144 divisors (see below), whose sum is σ = 70178838912. Its totient is φ = 5141283840.

The previous prime is 21031111327. The next prime is 21031111363. The reversal of 21031111332 is 23311113012.

21031111332 is a `hidden beast` number, since 2 + 10 + 311 + 11 + 332 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 176023 + ... + 270270.

It is an arithmetic number, because the mean of its divisors is an integer number (487353048).

Almost surely, 2^21031111332 is an apocalyptic number.

21031111332 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21031111332 is an abundant number, since it is smaller than the sum of its proper divisors (49147727580).

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

21031111332 is a wasteful number, since it uses less digits than its factorization.

21031111332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 446338 (or 446333 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 21031111332 its reverse (23311113012), we get a palindrome (44342224344).

The spelling of 21031111332 in words is "twenty-one billion, thirty-one million, one hundred eleven thousand, three hundred thirty-two".