21700475 has 6 divisors (see below), whose sum is σ = 26908620. Its totient is φ = 17360360.

The previous prime is 21700409. The next prime is 21700493. The reversal of 21700475 is 57400712.

It is not a de Polignac number, because 21700475 - 2⁸ = 21700219 is a prime.

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, 433985 + ... + 434034.

It is an arithmetic number, because the mean of its divisors is an integer number (4484770).

Almost surely, 2^21700475 is an apocalyptic number.

21700475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21700475 is a deficient number, since it is larger than the sum of its proper divisors (5208145).

21700475 is an equidigital number, since it uses as much as digits as its factorization.

21700475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 868029 (or 868024 counting only the distinct ones).

The product of its (nonzero) digits is 1960, while the sum is 26.

The square root of 21700475 is about 4658.3768632432. The cubic root of 21700475 is about 278.9264803737.

The spelling of 21700475 in words is "twenty-one million, seven hundred thousand, four hundred seventy-five".