21037700 has 36 divisors (see below), whose sum is σ = 46247040. Its totient is φ = 8305440.

The previous prime is 21037699. The next prime is 21037703. The reversal of 21037700 is 773012.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (21037703) 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, 6569 + ... + 9231.

It is an arithmetic number, because the mean of its divisors is an integer number (1284640).

Almost surely, 2^21037700 is an apocalyptic number.

21037700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21037700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23123520).

21037700 is an abundant number, since it is smaller than the sum of its proper divisors (25209340).

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

21037700 is a wasteful number, since it uses less digits than its factorization.

21037700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2756 (or 2749 counting only the distinct ones).

The product of its (nonzero) digits is 294, while the sum is 20.

The square root of 21037700 is about 4586.6872577057. The cubic root of 21037700 is about 276.0574164662.

The spelling of 21037700 in words is "twenty-one million, thirty-seven thousand, seven hundred".