20055021372121 has 2 divisors, whose sum is σ = 20055021372122. Its totient is φ = 20055021372120.

The previous prime is 20055021372073. The next prime is 20055021372131. The reversal of 20055021372121 is 12127312055002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18125114169600 + 1929907202521 = 4257360^2 + 1389211^2 .

It is a cyclic number.

It is not a de Polignac number, because 20055021372121 - 2²⁹ = 20054484501209 is a prime.

It is not a weakly prime, because it can be changed into another prime (20055021372131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10027510686060 + 10027510686061.

It is an arithmetic number, because the mean of its divisors is an integer number (10027510686061).

Almost surely, 2^{20055021372121} is an apocalyptic number.

It is an amenable number.

20055021372121 is a deficient number, since it is larger than the sum of its proper divisors (1).

20055021372121 is an equidigital number, since it uses as much as digits as its factorization.

20055021372121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8400, while the sum is 31.

The spelling of 20055021372121 in words is "twenty trillion, fifty-five billion, twenty-one million, three hundred seventy-two thousand, one hundred twenty-one".