121520156512 has 24 divisors (see below), whose sum is σ = 239278838400. Its totient is φ = 60750927744.

The previous prime is 121520156497. The next prime is 121520156531. The reversal of 121520156512 is 215651025121.

It is a super-2 number, since 2×121520156512² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67587 + ... + 497602.

It is an arithmetic number, because the mean of its divisors is an integer number (9969951600).

Almost surely, 2^121520156512 is an apocalyptic number.

It is an amenable number.

121520156512 is a deficient number, since it is larger than the sum of its proper divisors (117758681888).

121520156512 is an equidigital number, since it uses as much as digits as its factorization.

121520156512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 571918 (or 571910 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 31.

The spelling of 121520156512 in words is "one hundred twenty-one billion, five hundred twenty million, one hundred fifty-six thousand, five hundred twelve".