21137700 has 36 divisors (see below), whose sum is σ = 61159280. Its totient is φ = 5636640.

The previous prime is 21137689. The next prime is 21137707. The reversal of 21137700 is 773112.

It is a super-3 number, since 3×21137700³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (21137707) 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, 34930 + ... + 35529.

Almost surely, 2^21137700 is an apocalyptic number.

21137700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21137700 is an abundant number, since it is smaller than the sum of its proper divisors (40021580).

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

21137700 is a wasteful number, since it uses less digits than its factorization.

21137700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70476 (or 70469 counting only the distinct ones).

The product of its (nonzero) digits is 294, while the sum is 21.

The square root of 21137700 is about 4597.5754479943. The cubic root of 21137700 is about 276.4941263834.

The spelling of 21137700 in words is "twenty-one million, one hundred thirty-seven thousand, seven hundred".