21630698 has 32 divisors (see below), whose sum is σ = 35925120. Its totient is φ = 9725440.

The previous prime is 21630689. The next prime is 21630727. The reversal of 21630698 is 89603612.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82115 + ... + 82377.

It is an arithmetic number, because the mean of its divisors is an integer number (1122660).

Almost surely, 2^21630698 is an apocalyptic number.

21630698 is a deficient number, since it is larger than the sum of its proper divisors (14294422).

21630698 is a wasteful number, since it uses less digits than its factorization.

21630698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 21630698 is about 4650.8814218382. The cubic root of 21630698 is about 278.6272004297.

The spelling of 21630698 in words is "twenty-one million, six hundred thirty thousand, six hundred ninety-eight".