21550670 has 8 divisors (see below), whose sum is σ = 38791224. Its totient is φ = 8620264.

The previous prime is 21550667. The next prime is 21550691. The reversal of 21550670 is 7605512.

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, 1077524 + ... + 1077543.

It is an arithmetic number, because the mean of its divisors is an integer number (4848903).

Almost surely, 2^21550670 is an apocalyptic number.

21550670 is a deficient number, since it is larger than the sum of its proper divisors (17240554).

21550670 is a wasteful number, since it uses less digits than its factorization.

21550670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2155074.

The product of its (nonzero) digits is 2100, while the sum is 26.

The square root of 21550670 is about 4642.2699189082. The cubic root of 21550670 is about 278.2831595489.

The spelling of 21550670 in words is "twenty-one million, five hundred fifty thousand, six hundred seventy".