20271236221 has 2 divisors, whose sum is σ = 20271236222. Its totient is φ = 20271236220.

The previous prime is 20271236179. The next prime is 20271236267. The reversal of 20271236221 is 12263217202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14497364025 + 5773872196 = 120405^2 + 75986^2 .

It is a cyclic number.

It is not a de Polignac number, because 20271236221 - 2²¹ = 20269139069 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20271236221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20271236621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10135618110 + 10135618111.

It is an arithmetic number, because the mean of its divisors is an integer number (10135618111).

Almost surely, 2^20271236221 is an apocalyptic number.

It is an amenable number.

20271236221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20271236221 is an equidigital number, since it uses as much as digits as its factorization.

20271236221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 28.

The spelling of 20271236221 in words is "twenty billion, two hundred seventy-one million, two hundred thirty-six thousand, two hundred twenty-one".