121355162681 has 2 divisors, whose sum is σ = 121355162682. Its totient is φ = 121355162680.

The previous prime is 121355162629. The next prime is 121355162701. The reversal of 121355162681 is 186261553121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 112705232656 + 8649930025 = 335716^2 + 93005^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121355162681 is a prime.

It is a super-2 number, since 2×121355162681² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (121355162081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60677581340 + 60677581341.

It is an arithmetic number, because the mean of its divisors is an integer number (60677581341).

Almost surely, 2^121355162681 is an apocalyptic number.

It is an amenable number.

121355162681 is a deficient number, since it is larger than the sum of its proper divisors (1).

121355162681 is an equidigital number, since it uses as much as digits as its factorization.

121355162681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 86400, while the sum is 41.

The spelling of 121355162681 in words is "one hundred twenty-one billion, three hundred fifty-five million, one hundred sixty-two thousand, six hundred eighty-one".