21269700 has 54 divisors (see below), whose sum is σ = 66671514. Its totient is φ = 5671680.

The previous prime is 21269681. The next prime is 21269713. The reversal of 21269700 is 796212.

It can be written as a sum of positive squares in 3 ways, for example, as 4769856 + 16499844 = 2184^2 + 4062^2 .

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 10917 + ... + 12716.

Almost surely, 2^21269700 is an apocalyptic number.

21269700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21269700 is an abundant number, since it is smaller than the sum of its proper divisors (45401814).

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

21269700 is a wasteful number, since it uses less digits than its factorization.

21269700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23653 (or 23643 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 21269700 is about 4611.9084986587. The cubic root of 21269700 is about 277.0684795525.

The spelling of 21269700 in words is "twenty-one million, two hundred sixty-nine thousand, seven hundred".