21358422 has 24 divisors (see below), whose sum is σ = 46361640. Its totient is φ = 7106400.

The previous prime is 21358399. The next prime is 21358429. The reversal of 21358422 is 22485312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21358429) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18354 + ... + 19482.

It is an arithmetic number, because the mean of its divisors is an integer number (1931735).

Almost surely, 2^21358422 is an apocalyptic number.

21358422 is an abundant number, since it is smaller than the sum of its proper divisors (25003218).

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

21358422 is a wasteful number, since it uses less digits than its factorization.

21358422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2188 (or 2185 counting only the distinct ones).

The product of its digits is 3840, while the sum is 27.

The square root of 21358422 is about 4621.5172833172. The cubic root of 21358422 is about 277.4531890848.

The spelling of 21358422 in words is "twenty-one million, three hundred fifty-eight thousand, four hundred twenty-two".