21037900 has 36 divisors (see below), whose sum is σ = 49166992. Its totient is φ = 7767360.

The previous prime is 21037897. The next prime is 21037901. The reversal of 21037900 is 973012.

It is not an unprimeable number, because it can be changed into a prime (21037901) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6792 + ... + 9391.

Almost surely, 2^21037900 is an apocalyptic number.

21037900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21037900 is an abundant number, since it is smaller than the sum of its proper divisors (28129092).

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

21037900 is a wasteful number, since it uses less digits than its factorization.

21037900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16210 (or 16203 counting only the distinct ones).

The product of its (nonzero) digits is 378, while the sum is 22.

The square root of 21037900 is about 4586.7090598816. The cubic root of 21037900 is about 276.0582912657.

The spelling of 21037900 in words is "twenty-one million, thirty-seven thousand, nine hundred".