121517712740 has 24 divisors (see below), whose sum is σ = 255287652480. Its totient is φ = 48587950688.

The previous prime is 121517712737. The next prime is 121517712779. The reversal of 121517712740 is 47217715121.

It is a super-2 number, since 2×121517712740² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 121517712694 and 121517712703.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1143770 + ... + 1245489.

It is an arithmetic number, because the mean of its divisors is an integer number (10636985520).

Almost surely, 2^121517712740 is an apocalyptic number.

121517712740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121517712740 is an abundant number, since it is smaller than the sum of its proper divisors (133769939740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121517712740 is a wasteful number, since it uses less digits than its factorization.

121517712740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2391811 (or 2391809 counting only the distinct ones).

The product of its (nonzero) digits is 27440, while the sum is 38.

The spelling of 121517712740 in words is "one hundred twenty-one billion, five hundred seventeen million, seven hundred twelve thousand, seven hundred forty".