20456025221 has 2 divisors, whose sum is σ = 20456025222. Its totient is φ = 20456025220.

The previous prime is 20456025199. The next prime is 20456025229. The reversal of 20456025221 is 12252065402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19666977121 + 789048100 = 140239^2 + 28090^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20456025221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20456025229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10228012610 + 10228012611.

It is an arithmetic number, because the mean of its divisors is an integer number (10228012611).

Almost surely, 2^20456025221 is an apocalyptic number.

It is an amenable number.

20456025221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20456025221 is an equidigital number, since it uses as much as digits as its factorization.

20456025221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9600, while the sum is 29.

The spelling of 20456025221 in words is "twenty billion, four hundred fifty-six million, twenty-five thousand, two hundred twenty-one".