21412422 has 12 divisors (see below), whose sum is σ = 46393620. Its totient is φ = 7137468.

The previous prime is 21412387. The next prime is 21412429. The reversal of 21412422 is 22421412.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 1189579 = 21412422 / (2 + 1 + 4 + 1 + 2 + 4 + 2 + 2).

It is a junction number, because it is equal to n+sod(n) for n = 21412395 and 21412404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21412429) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 594772 + ... + 594807.

It is an arithmetic number, because the mean of its divisors is an integer number (3866135).

Almost surely, 2^21412422 is an apocalyptic number.

21412422 is an abundant number, since it is smaller than the sum of its proper divisors (24981198).

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

21412422 is a wasteful number, since it uses less digits than its factorization.

21412422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1189587 (or 1189584 counting only the distinct ones).

The product of its digits is 256, while the sum is 18.

The square root of 21412422 is about 4627.3558324382. The cubic root of 21412422 is about 277.6868184435.

Adding to 21412422 its reverse (22421412), we get a palindrome (43833834).

The spelling of 21412422 in words is "twenty-one million, four hundred twelve thousand, four hundred twenty-two".