21073332 has 36 divisors (see below), whose sum is σ = 57200640. Its totient is φ = 6020784.

The previous prime is 21073321. The next prime is 21073363. The reversal of 21073332 is 23337012.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 21073299 and 21073308.

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 in 11 ways as a sum of consecutive naturals, for example, 17332 + ... + 18507.

Almost surely, 2^21073332 is an apocalyptic number.

It is an amenable number.

21073332 is an abundant number, since it is smaller than the sum of its proper divisors (36127308).

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

21073332 is a wasteful number, since it uses less digits than its factorization.

21073332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35860 (or 35851 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 21.

The square root of 21073332 is about 4590.5698992609. The cubic root of 21073332 is about 276.2131833302.

The spelling of 21073332 in words is "twenty-one million, seventy-three thousand, three hundred thirty-two".