21876890 has 16 divisors (see below), whose sum is σ = 45004032. Its totient is φ = 7500624.

The previous prime is 21876871. The next prime is 21876901. The reversal of 21876890 is 9867812.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 156194 + ... + 156333.

It is an arithmetic number, because the mean of its divisors is an integer number (2812752).

Almost surely, 2^21876890 is an apocalyptic number.

21876890 is an abundant number, since it is smaller than the sum of its proper divisors (23127142).

21876890 is a wasteful number, since it uses less digits than its factorization.

21876890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312541.

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

The square root of 21876890 is about 4677.2737786022. The cubic root of 21876890 is about 279.6802898488.

The spelling of 21876890 in words is "twenty-one million, eight hundred seventy-six thousand, eight hundred ninety".