22147621 has 4 divisors (see below), whose sum is σ = 22207372. Its totient is φ = 22087872.

The previous prime is 22147607. The next prime is 22147639. The reversal of 22147621 is 12674122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16695396 + 5452225 = 4086^2 + 2335^2 .

It is a cyclic number.

It is not a de Polignac number, because 22147621 - 2⁹ = 22147109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22147681) 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, 29316 + ... + 30061.

It is an arithmetic number, because the mean of its divisors is an integer number (5551843).

Almost surely, 2^22147621 is an apocalyptic number.

It is an amenable number.

22147621 is a deficient number, since it is larger than the sum of its proper divisors (59751).

22147621 is an equidigital number, since it uses as much as digits as its factorization.

22147621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59750.

The product of its digits is 1344, while the sum is 25.

The square root of 22147621 is about 4706.1259014183. The cubic root of 22147621 is about 280.8292635214.

The spelling of 22147621 in words is "twenty-two million, one hundred forty-seven thousand, six hundred twenty-one".