21470886 has 32 divisors (see below), whose sum is σ = 47953920. Its totient is φ = 7120872.

The previous prime is 21470843. The next prime is 21470899. The reversal of 21470886 is 68807412.

It is a self number, because there is not a number n which added to its sum of digits gives 21470886.

It is a congruent number.

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, 11151 + ... + 12933.

It is an arithmetic number, because the mean of its divisors is an integer number (1498560).

Almost surely, 2^21470886 is an apocalyptic number.

21470886 is an abundant number, since it is smaller than the sum of its proper divisors (26483034).

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

21470886 is a wasteful number, since it uses less digits than its factorization.

21470886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2017 (or 2011 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 21470886 is about 4633.6687408575. The cubic root of 21470886 is about 277.9393187432.

The spelling of 21470886 in words is "twenty-one million, four hundred seventy thousand, eight hundred eighty-six".