121557107474 has 24 divisors (see below), whose sum is σ = 200569645584. Its totient is φ = 55253084260.

The previous prime is 121557107453. The next prime is 121557107491. The reversal of 121557107474 is 474701755121.

It is a happy number.

It is a super-2 number, since 2×121557107474² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 133409 + ... + 510795.

It is an arithmetic number, because the mean of its divisors is an integer number (8357068566).

Almost surely, 2^121557107474 is an apocalyptic number.

121557107474 is a deficient number, since it is larger than the sum of its proper divisors (79012538110).

121557107474 is an frugal number, since it uses more digits than its factorization.

121557107474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377444 (or 377400 counting only the distinct ones).

The product of its (nonzero) digits is 274400, while the sum is 44.

The spelling of 121557107474 in words is "one hundred twenty-one billion, five hundred fifty-seven million, one hundred seven thousand, four hundred seventy-four".