21285698 has 12 divisors (see below), whose sum is σ = 37141542. Its totient is φ = 9122400.

The previous prime is 21285679. The next prime is 21285703. The reversal of 21285698 is 89658212.

It can be written as a sum of positive squares in only one way, i.e., 21279769 + 5929 = 4613^2 + 77^2 .

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, 108503 + ... + 108698.

Almost surely, 2^21285698 is an apocalyptic number.

21285698 is a deficient number, since it is larger than the sum of its proper divisors (15855844).

21285698 is a wasteful number, since it uses less digits than its factorization.

21285698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217217 (or 217210 counting only the distinct ones).

The product of its digits is 69120, while the sum is 41.

The square root of 21285698 is about 4613.6425956071. The cubic root of 21285698 is about 277.1379278081.

The spelling of 21285698 in words is "twenty-one million, two hundred eighty-five thousand, six hundred ninety-eight".