121315122281 has 2 divisors, whose sum is σ = 121315122282. Its totient is φ = 121315122280.

The previous prime is 121315122239. The next prime is 121315122359. The reversal of 121315122281 is 182221513121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80477179225 + 40837943056 = 283685^2 + 202084^2 .

It is a cyclic number.

It is not a de Polignac number, because 121315122281 - 2¹⁴ = 121315105897 is a prime.

It is a super-2 number, since 2×121315122281² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (121315122221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60657561140 + 60657561141.

It is an arithmetic number, because the mean of its divisors is an integer number (60657561141).

Almost surely, 2^121315122281 is an apocalyptic number.

It is an amenable number.

121315122281 is a deficient number, since it is larger than the sum of its proper divisors (1).

121315122281 is an equidigital number, since it uses as much as digits as its factorization.

121315122281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1920, while the sum is 29.

The spelling of 121315122281 in words is "one hundred twenty-one billion, three hundred fifteen million, one hundred twenty-two thousand, two hundred eighty-one".