121331940 has 96 divisors (see below), whose sum is σ = 355380480. Its totient is φ = 30890496.

The previous prime is 121331927. The next prime is 121331983. The reversal of 121331940 is 49133121.

It is a self number, because there is not a number n which added to its sum of digits gives 121331940.

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, 178882 + ... + 179558.

It is an arithmetic number, because the mean of its divisors is an integer number (3701880).

Almost surely, 2^121331940 is an apocalyptic number.

121331940 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 121331940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (177690240).

121331940 is an abundant number, since it is smaller than the sum of its proper divisors (234048540).

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

121331940 is a wasteful number, since it uses less digits than its factorization.

121331940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 821 (or 819 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 121331940 is about 11015.0778481135. The cubic root of 121331940 is about 495.0606190428.

It can be divided in two parts, 1213 and 31940, that added together give a triangular number (33153 = T₂₅₇).

The spelling of 121331940 in words is "one hundred twenty-one million, three hundred thirty-one thousand, nine hundred forty".