21871622 has 16 divisors (see below), whose sum is σ = 36566640. Its totient is φ = 9750528.

The previous prime is 21871609. The next prime is 21871631. The reversal of 21871622 is 22617812.

It is a congruent number.

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, 16283 + ... + 17574.

It is an arithmetic number, because the mean of its divisors is an integer number (2285415).

Almost surely, 2^21871622 is an apocalyptic number.

21871622 is a deficient number, since it is larger than the sum of its proper divisors (14695018).

21871622 is a wasteful number, since it uses less digits than its factorization.

21871622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33895.

The product of its digits is 2688, while the sum is 29.

The square root of 21871622 is about 4676.7105961349. The cubic root of 21871622 is about 279.6578388507.

The spelling of 21871622 in words is "twenty-one million, eight hundred seventy-one thousand, six hundred twenty-two".