21079700 has 36 divisors (see below), whose sum is σ = 45968412. Its totient is φ = 8390400.

The previous prime is 21079693. The next prime is 21079703. The reversal of 21079700 is 797012.

It can be written as a sum of positive squares in 6 ways, for example, as 8491396 + 12588304 = 2914^2 + 3548^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21079700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21079703) 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, 27320 + ... + 28080.

Almost surely, 2^21079700 is an apocalyptic number.

21079700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21079700 is an abundant number, since it is smaller than the sum of its proper divisors (24888712).

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

21079700 is a wasteful number, since it uses less digits than its factorization.

21079700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1052 (or 1045 counting only the distinct ones).

The product of its (nonzero) digits is 882, while the sum is 26.

The square root of 21079700 is about 4591.2634426702. The cubic root of 21079700 is about 276.2410028259.

The spelling of 21079700 in words is "twenty-one million, seventy-nine thousand, seven hundred".