21622689 has 24 divisors (see below), whose sum is σ = 34998912. Its totient is φ = 12748320.

The previous prime is 21622681. The next prime is 21622693. The reversal of 21622689 is 98622612.

It is a happy number.

21622689 is a `hidden beast` number, since 21 + 622 + 6 + 8 + 9 = 666.

It is not a de Polignac number, because 21622689 - 2³ = 21622681 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21622681) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 712 + ... + 6614.

It is an arithmetic number, because the mean of its divisors is an integer number (1458288).

Almost surely, 2^21622689 is an apocalyptic number.

It is an amenable number.

21622689 is a deficient number, since it is larger than the sum of its proper divisors (13376223).

21622689 is a wasteful number, since it uses less digits than its factorization.

21622689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5957 (or 5954 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 21622689 is about 4650.0203225362. The cubic root of 21622689 is about 278.5928079393.

It can be divided in two parts, 2162 and 2689, that added together give a triangular number (4851 = T₉₈).

The spelling of 21622689 in words is "twenty-one million, six hundred twenty-two thousand, six hundred eighty-nine".