21641622 has 16 divisors (see below), whose sum is σ = 43571712. Its totient is φ = 7165800.

The previous prime is 21641611. The next prime is 21641671. The reversal of 21641622 is 22614612.

It is a junction number, because it is equal to n+sod(n) for n = 21641592 and 21641601.

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, 11038 + ... + 12849.

It is an arithmetic number, because the mean of its divisors is an integer number (2723232).

Almost surely, 2^21641622 is an apocalyptic number.

21641622 is an abundant number, since it is smaller than the sum of its proper divisors (21930090).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21641622 is a wasteful number, since it uses less digits than its factorization.

21641622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24043.

The product of its digits is 1152, while the sum is 24.

The square root of 21641622 is about 4652.0556746453. The cubic root of 21641622 is about 278.6740969176.

The spelling of 21641622 in words is "twenty-one million, six hundred forty-one thousand, six hundred twenty-two".