121092145128 has 32 divisors (see below), whose sum is σ = 336367070400. Its totient is φ = 40364048304.

The previous prime is 121092145117. The next prime is 121092145133. The reversal of 121092145128 is 821541290121.

121092145128 is a `hidden beast` number, since 12 + 109 + 21 + 4 + 512 + 8 = 666.

It is a super-2 number, since 2×121092145128² (a number of 23 digits) contains 22 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 121092145092 and 121092145101.

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, 280305676 + ... + 280306107.

It is an arithmetic number, because the mean of its divisors is an integer number (10511470950).

Almost surely, 2^121092145128 is an apocalyptic number.

121092145128 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

121092145128 is an abundant number, since it is smaller than the sum of its proper divisors (215274925272).

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

121092145128 is a wasteful number, since it uses less digits than its factorization.

121092145128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 560611798 (or 560611788 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 36.

The spelling of 121092145128 in words is "one hundred twenty-one billion, ninety-two million, one hundred forty-five thousand, one hundred twenty-eight".