20122210621 has 2 divisors, whose sum is σ = 20122210622. Its totient is φ = 20122210620.

The previous prime is 20122210571. The next prime is 20122210649. The reversal of 20122210621 is 12601222102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16012118521 + 4110092100 = 126539^2 + 64110^2 .

It is a cyclic number.

It is not a de Polignac number, because 20122210621 - 2⁹ = 20122210109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20122210651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10061105310 + 10061105311.

It is an arithmetic number, because the mean of its divisors is an integer number (10061105311).

Almost surely, 2^20122210621 is an apocalyptic number.

It is an amenable number.

20122210621 is a deficient number, since it is larger than the sum of its proper divisors (1).

20122210621 is an equidigital number, since it uses as much as digits as its factorization.

20122210621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 20122210621 its reverse (12601222102), we get a palindrome (32723432723).

The spelling of 20122210621 in words is "twenty billion, one hundred twenty-two million, two hundred ten thousand, six hundred twenty-one".