121022200172557 has 2 divisors, whose sum is σ = 121022200172558. Its totient is φ = 121022200172556.

The previous prime is 121022200172513. The next prime is 121022200172591. The reversal of 121022200172557 is 755271002220121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 98560041363081 + 22462158809476 = 9927741^2 + 4739426^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121022200172557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121022200172057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60511100086278 + 60511100086279.

It is an arithmetic number, because the mean of its divisors is an integer number (60511100086279).

Almost surely, 2^{121022200172557} is an apocalyptic number.

It is an amenable number.

121022200172557 is a deficient number, since it is larger than the sum of its proper divisors (1).

121022200172557 is an equidigital number, since it uses as much as digits as its factorization.

121022200172557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 39200, while the sum is 37.

Adding to 121022200172557 its reverse (755271002220121), we get a palindrome (876293202392678).

The spelling of 121022200172557 in words is "one hundred twenty-one trillion, twenty-two billion, two hundred million, one hundred seventy-two thousand, five hundred fifty-seven".