121221004940 has 72 divisors (see below), whose sum is σ = 296795115792. Its totient is φ = 41467520640.

The previous prime is 121221004939. The next prime is 121221004943. The reversal of 121221004940 is 49400122121.

It is not an unprimeable number, because it can be changed into a prime (121221004943) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 294530 + ... + 573750.

It is an arithmetic number, because the mean of its divisors is an integer number (4122154386).

Almost surely, 2^121221004940 is an apocalyptic number.

121221004940 is a gapful number since it is divisible by the number (10) 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 121221004940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (148397557896).

121221004940 is an abundant number, since it is smaller than the sum of its proper divisors (175574110852).

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

121221004940 is a wasteful number, since it uses less digits than its factorization.

121221004940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279687 (or 279678 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The spelling of 121221004940 in words is "one hundred twenty-one billion, two hundred twenty-one million, four thousand, nine hundred forty".