21700468 has 12 divisors (see below), whose sum is σ = 39285540. Its totient is φ = 10476032.

The previous prime is 21700409. The next prime is 21700493. The reversal of 21700468 is 86400712.

It can be written as a sum of positive squares in 2 ways, for example, as 8538084 + 13162384 = 2922^2 + 3628^2 .

It is a super-2 number, since 2×21700468² = 941820622838048, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93421 + ... + 93652.

It is an arithmetic number, because the mean of its divisors is an integer number (3273795).

Almost surely, 2^21700468 is an apocalyptic number.

It is an amenable number.

21700468 is a deficient number, since it is larger than the sum of its proper divisors (17585072).

21700468 is a wasteful number, since it uses less digits than its factorization.

21700468 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187106 (or 187104 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 21700468 is about 4658.3761119085. The cubic root of 21700468 is about 278.9264503822.

The spelling of 21700468 in words is "twenty-one million, seven hundred thousand, four hundred sixty-eight".