121140978 has 64 divisors (see below), whose sum is σ = 286820352. Its totient is φ = 33390720.

The previous prime is 121140973. The next prime is 121141003. The reversal of 121140978 is 879041121.

It is a super-3 number, since 3×121140978³ (a number of 25 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (121140973) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 177025 + ... + 177707.

It is an arithmetic number, because the mean of its divisors is an integer number (4481568).

Almost surely, 2^121140978 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121140978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (143410176).

121140978 is an abundant number, since it is smaller than the sum of its proper divisors (165679374).

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

121140978 is a wasteful number, since it uses less digits than its factorization.

121140978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 839.

The product of its (nonzero) digits is 4032, while the sum is 33.

The square root of 121140978 is about 11006.4062254671. The cubic root of 121140978 is about 494.8007605466.

The spelling of 121140978 in words is "one hundred twenty-one million, one hundred forty thousand, nine hundred seventy-eight".