21037396 has 12 divisors (see below), whose sum is σ = 37510452. Its totient is φ = 10320128.

The previous prime is 21037369. The next prime is 21037409. The reversal of 21037396 is 69373012.

It can be written as a sum of positive squares in 2 ways, for example, as 5827396 + 15210000 = 2414^2 + 3900^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49405 + ... + 49828.

It is an arithmetic number, because the mean of its divisors is an integer number (3125871).

Almost surely, 2^21037396 is an apocalyptic number.

It is an amenable number.

21037396 is a deficient number, since it is larger than the sum of its proper divisors (16473056).

21037396 is a wasteful number, since it uses less digits than its factorization.

21037396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99290 (or 99288 counting only the distinct ones).

The product of its (nonzero) digits is 6804, while the sum is 31.

The square root of 21037396 is about 4586.6541181999. The cubic root of 21037396 is about 276.0560867603.

The spelling of 21037396 in words is "twenty-one million, thirty-seven thousand, three hundred ninety-six".