20222621 has 2 divisors, whose sum is σ = 20222622. Its totient is φ = 20222620.

The previous prime is 20222611. The next prime is 20222689. The reversal of 20222621 is 12622202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19096900 + 1125721 = 4370^2 + 1061^2 .

It is a cyclic number.

It is not a de Polignac number, because 20222621 - 2⁶ = 20222557 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20222621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20222611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10111310 + 10111311.

It is an arithmetic number, because the mean of its divisors is an integer number (10111311).

Almost surely, 2^20222621 is an apocalyptic number.

It is an amenable number.

20222621 is a deficient number, since it is larger than the sum of its proper divisors (1).

20222621 is an equidigital number, since it uses as much as digits as its factorization.

20222621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 20222621 is about 4496.9568599221. The cubic root of 20222621 is about 272.4451916817.

Adding to 20222621 its reverse (12622202), we get a palindrome (32844823).

The spelling of 20222621 in words is "twenty million, two hundred twenty-two thousand, six hundred twenty-one".