21299670 has 48 divisors (see below), whose sum is σ = 63292320. Its totient is φ = 4868352.

The previous prime is 21299669. The next prime is 21299687. The reversal of 21299670 is 7699212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16275 + ... + 17534.

It is an arithmetic number, because the mean of its divisors is an integer number (1318590).

Almost surely, 2^21299670 is an apocalyptic number.

21299670 is an abundant number, since it is smaller than the sum of its proper divisors (41992650).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21299670 is a wasteful number, since it uses less digits than its factorization.

21299670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33829 (or 33826 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 21299670 is about 4615.1565520576. The cubic root of 21299670 is about 277.1985526183.

The spelling of 21299670 in words is "twenty-one million, two hundred ninety-nine thousand, six hundred seventy".