22031621 has 8 divisors (see below), whose sum is σ = 23410080. Its totient is φ = 20675088.

The previous prime is 22031617. The next prime is 22031627. The reversal of 22031621 is 12613022.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 22031621 - 2² = 22031617 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22031621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22031627) 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, 3386 + ... + 7451.

It is an arithmetic number, because the mean of its divisors is an integer number (2926260).

Almost surely, 2^22031621 is an apocalyptic number.

It is an amenable number.

22031621 is a deficient number, since it is larger than the sum of its proper divisors (1378459).

22031621 is a wasteful number, since it uses less digits than its factorization.

22031621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10963.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 22031621 is about 4693.7853593875. The cubic root of 22031621 is about 280.3381162006.

Adding to 22031621 its reverse (12613022), we get a palindrome (34644643).

The spelling of 22031621 in words is "twenty-two million, thirty-one thousand, six hundred twenty-one".