21700869 has 16 divisors (see below), whose sum is σ = 30578880. Its totient is φ = 13651200.

The previous prime is 21700843. The next prime is 21700873. The reversal of 21700869 is 96800712.

It is not a de Polignac number, because 21700869 - 2⁷ = 21700741 is a prime.

It is a super-2 number, since 2×21700869² = 941855430710322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21700829) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17469 + ... + 18669.

It is an arithmetic number, because the mean of its divisors is an integer number (1911180).

Almost surely, 2^21700869 is an apocalyptic number.

It is an amenable number.

21700869 is a deficient number, since it is larger than the sum of its proper divisors (8878011).

21700869 is a wasteful number, since it uses less digits than its factorization.

21700869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1540.

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 21700869 is about 4658.4191524593. The cubic root of 21700869 is about 278.9281684530.

The spelling of 21700869 in words is "twenty-one million, seven hundred thousand, eight hundred sixty-nine".