21031132 has 6 divisors (see below), whose sum is σ = 36804488. Its totient is φ = 10515564.

The previous prime is 21031111. The next prime is 21031151. The reversal of 21031132 is 23113012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2628888 + ... + 2628895.

Almost surely, 2^21031132 is an apocalyptic number.

It is an amenable number.

21031132 is a deficient number, since it is larger than the sum of its proper divisors (15773356).

21031132 is a wasteful number, since it uses less digits than its factorization.

21031132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5257787 (or 5257785 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 21031132 is about 4585.9712166563. The cubic root of 21031132 is about 276.0286849693.

Adding to 21031132 its reverse (23113012), we get a palindrome (44144144).

The spelling of 21031132 in words is "twenty-one million, thirty-one thousand, one hundred thirty-two".