121351716503423 has 12 divisors (see below), whose sum is σ = 141165599526432. Its totient is φ = 104014756460160.

The previous prime is 121351716503333. The next prime is 121351716503477. The reversal of 121351716503423 is 324305617153121.

It is a happy number.

It is not a de Polignac number, because 121351716503423 - 2²² = 121351712309119 is a prime.

It is a super-2 number, since 2×121351716503423² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121351716503923) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6742583 + ... + 16975448.

It is an arithmetic number, because the mean of its divisors is an integer number (11763799960536).

Almost surely, 2^{121351716503423} is an apocalyptic number.

121351716503423 is a deficient number, since it is larger than the sum of its proper divisors (19813883023009).

121351716503423 is a wasteful number, since it uses less digits than its factorization.

121351716503423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23822462 (or 23822455 counting only the distinct ones).

The product of its (nonzero) digits is 453600, while the sum is 44.

The spelling of 121351716503423 in words is "one hundred twenty-one trillion, three hundred fifty-one billion, seven hundred sixteen million, five hundred three thousand, four hundred twenty-three".