21970886 has 8 divisors (see below), whose sum is σ = 37664400. Its totient is φ = 9416088.

The previous prime is 21970867. The next prime is 21970891. The reversal of 21970886 is 68807912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 784661 + ... + 784688.

It is an arithmetic number, because the mean of its divisors is an integer number (4708050).

Almost surely, 2^21970886 is an apocalyptic number.

21970886 is a deficient number, since it is larger than the sum of its proper divisors (15693514).

21970886 is a wasteful number, since it uses less digits than its factorization.

21970886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1569358.

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

The square root of 21970886 is about 4687.3111695299. The cubic root of 21970886 is about 280.0802746025.

The spelling of 21970886 in words is "twenty-one million, nine hundred seventy thousand, eight hundred eighty-six".