21073132 has 12 divisors (see below), whose sum is σ = 39047400. Its totient is φ = 9916736.

The previous prime is 21073127. The next prime is 21073141. The reversal of 21073132 is 23137012.

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 in 3 ways as a sum of consecutive naturals, for example, 154882 + ... + 155017.

It is an arithmetic number, because the mean of its divisors is an integer number (3253950).

Almost surely, 2^21073132 is an apocalyptic number.

It is an amenable number.

21073132 is a deficient number, since it is larger than the sum of its proper divisors (17974268).

21073132 is a wasteful number, since it uses less digits than its factorization.

21073132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309920 (or 309918 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 19.

The square root of 21073132 is about 4590.5481154215. The cubic root of 21073132 is about 276.2123095116.

The spelling of 21073132 in words is "twenty-one million, seventy-three thousand, one hundred thirty-two".