21622542 has 16 divisors (see below), whose sum is σ = 43334352. Its totient is φ = 7192640.

The previous prime is 21622501. The next prime is 21622543. The reversal of 21622542 is 24522612.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21622543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 333 + ... + 6584.

It is an arithmetic number, because the mean of its divisors is an integer number (2708397).

Almost surely, 2^21622542 is an apocalyptic number.

21622542 is an abundant number, since it is smaller than the sum of its proper divisors (21711810).

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

21622542 is a wasteful number, since it uses less digits than its factorization.

21622542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7443.

The product of its digits is 1920, while the sum is 24.

The square root of 21622542 is about 4650.0045161268. The cubic root of 21622542 is about 278.5921766081.

The spelling of 21622542 in words is "twenty-one million, six hundred twenty-two thousand, five hundred forty-two".