21870698 has 32 divisors (see below), whose sum is σ = 35458560. Its totient is φ = 10097920.

The previous prime is 21870679. The next prime is 21870713. The reversal of 21870698 is 89607812.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 193490 + ... + 193602.

It is an arithmetic number, because the mean of its divisors is an integer number (1108080).

Almost surely, 2^21870698 is an apocalyptic number.

21870698 is a deficient number, since it is larger than the sum of its proper divisors (13587862).

21870698 is a wasteful number, since it uses less digits than its factorization.

21870698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262.

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 21870698 is about 4676.6118077087. The cubic root of 21870698 is about 279.6539006047.

The spelling of 21870698 in words is "twenty-one million, eight hundred seventy thousand, six hundred ninety-eight".