121121999948857 has 2 divisors, whose sum is σ = 121121999948858. Its totient is φ = 121121999948856.

The previous prime is 121121999948809. The next prime is 121121999948899. The reversal of 121121999948857 is 758849999121121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120610561856656 + 511438092201 = 10982284^2 + 715149^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121121999948857 is a prime.

It is a super-2 number, since 2×121121999948857² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (121121999948657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60560999974428 + 60560999974429.

It is an arithmetic number, because the mean of its divisors is an integer number (60560999974429).

Almost surely, 2^{121121999948857} is an apocalyptic number.

It is an amenable number.

121121999948857 is a deficient number, since it is larger than the sum of its proper divisors (1).

121121999948857 is an equidigital number, since it uses as much as digits as its factorization.

121121999948857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 235146240, while the sum is 76.

The spelling of 121121999948857 in words is "one hundred twenty-one trillion, one hundred twenty-one billion, nine hundred ninety-nine million, nine hundred forty-eight thousand, eight hundred fifty-seven".