21622137 has 4 divisors (see below), whose sum is σ = 28829520. Its totient is φ = 14414756.

The previous prime is 21622123. The next prime is 21622141. The reversal of 21622137 is 73122612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21622137 - 2⁸ = 21621881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21622157) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3603687 + ... + 3603692.

It is an arithmetic number, because the mean of its divisors is an integer number (7207380).

Almost surely, 2^21622137 is an apocalyptic number.

It is an amenable number.

21622137 is a deficient number, since it is larger than the sum of its proper divisors (7207383).

21622137 is an equidigital number, since it uses as much as digits as its factorization.

21622137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7207382.

The product of its digits is 1008, while the sum is 24.

The square root of 21622137 is about 4649.9609675781. The cubic root of 21622137 is about 278.5904372114.

Adding to 21622137 its reverse (73122612), we get a palindrome (94744749).

The spelling of 21622137 in words is "twenty-one million, six hundred twenty-two thousand, one hundred thirty-seven".