121239902893 has 2 divisors, whose sum is σ = 121239902894. Its totient is φ = 121239902892.

The previous prime is 121239902887. The next prime is 121239902897. The reversal of 121239902893 is 398209932121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120910589284 + 329313609 = 347722^2 + 18147^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121239902893 is a prime.

It is a super-2 number, since 2×121239902893² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121239902897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60619951446 + 60619951447.

It is an arithmetic number, because the mean of its divisors is an integer number (60619951447).

Almost surely, 2^121239902893 is an apocalyptic number.

It is an amenable number.

121239902893 is a deficient number, since it is larger than the sum of its proper divisors (1).

121239902893 is an equidigital number, since it uses as much as digits as its factorization.

121239902893 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 419904, while the sum is 49.

The spelling of 121239902893 in words is "one hundred twenty-one billion, two hundred thirty-nine million, nine hundred two thousand, eight hundred ninety-three".