21470700 has 36 divisors (see below), whose sum is σ = 62122760. Its totient is φ = 5725440.

The previous prime is 21470653. The next prime is 21470723. The reversal of 21470700 is 707412.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35485 + ... + 36084.

Almost surely, 2^21470700 is an apocalyptic number.

21470700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21470700 is an abundant number, since it is smaller than the sum of its proper divisors (40652060).

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

21470700 is a wasteful number, since it uses less digits than its factorization.

21470700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71586 (or 71579 counting only the distinct ones).

The product of its (nonzero) digits is 392, while the sum is 21.

The square root of 21470700 is about 4633.6486703245. The cubic root of 21470700 is about 277.9385161547.

The spelling of 21470700 in words is "twenty-one million, four hundred seventy thousand, seven hundred".