21878902 has 8 divisors (see below), whose sum is σ = 32848200. Its totient is φ = 10929504.

The previous prime is 21878897. The next prime is 21878929. The reversal of 21878902 is 20987812.

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

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, 1827 + ... + 6862.

It is an arithmetic number, because the mean of its divisors is an integer number (4106025).

Almost surely, 2^21878902 is an apocalyptic number.

21878902 is a deficient number, since it is larger than the sum of its proper divisors (10969298).

21878902 is a wasteful number, since it uses less digits than its factorization.

21878902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9950.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 21878902 is about 4677.4888562133. The cubic root of 21878902 is about 279.6888635765.

The spelling of 21878902 in words is "twenty-one million, eight hundred seventy-eight thousand, nine hundred two".