21703400 has 24 divisors (see below), whose sum is σ = 50460870. Its totient is φ = 8681280.

The previous prime is 21703399. The next prime is 21703417. The reversal of 21703400 is 430712.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 18887716 + 2815684 = 4346^2 + 1678^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 54059 + ... + 54458.

Almost surely, 2^21703400 is an apocalyptic number.

21703400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21703400 is an abundant number, since it is smaller than the sum of its proper divisors (28757470).

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

21703400 is a wasteful number, since it uses less digits than its factorization.

21703400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108533 (or 108524 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 17.

The square root of 21703400 is about 4658.6908032193. The cubic root of 21703400 is about 278.9390119473.

The spelling of 21703400 in words is "twenty-one million, seven hundred three thousand, four hundred".