20272318621 has 2 divisors, whose sum is σ = 20272318622. Its totient is φ = 20272318620.

The previous prime is 20272318613. The next prime is 20272318631. The reversal of 20272318621 is 12681327202.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19997919396 + 274399225 = 141414^2 + 16565^2 .

It is a cyclic number.

It is not a de Polignac number, because 20272318621 - 2³ = 20272318613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20272318631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10136159310 + 10136159311.

It is an arithmetic number, because the mean of its divisors is an integer number (10136159311).

Almost surely, 2^20272318621 is an apocalyptic number.

It is an amenable number.

20272318621 is a deficient number, since it is larger than the sum of its proper divisors (1).

20272318621 is an equidigital number, since it uses as much as digits as its factorization.

20272318621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 34.

The spelling of 20272318621 in words is "twenty billion, two hundred seventy-two million, three hundred eighteen thousand, six hundred twenty-one".