121017157812 has 96 divisors (see below), whose sum is σ = 323829273600. Its totient is φ = 39063331296.

The previous prime is 121017157733. The next prime is 121017157823. The reversal of 121017157812 is 218751710121.

121017157812 is a `hidden beast` number, since 1 + 2 + 1 + 0 + 1 + 71 + 578 + 12 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 285193 + ... + 568655.

It is an arithmetic number, because the mean of its divisors is an integer number (3373221600).

Almost surely, 2^121017157812 is an apocalyptic number.

121017157812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121017157812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (161914636800).

121017157812 is an abundant number, since it is smaller than the sum of its proper divisors (202812115788).

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

121017157812 is a wasteful number, since it uses less digits than its factorization.

121017157812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283602 (or 283594 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 36.

Adding to 121017157812 its reverse (218751710121), we get a palindrome (339768867933).

The spelling of 121017157812 in words is "one hundred twenty-one billion, seventeen million, one hundred fifty-seven thousand, eight hundred twelve".