121621140 has 72 divisors (see below), whose sum is σ = 371055048. Its totient is φ = 32244480.

The previous prime is 121621133. The next prime is 121621163. The reversal of 121621140 is 41126121.

121621140 is a `hidden beast` number, since 1 + 2 + 1 + 621 + 1 + 40 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 4356 + 121616784 = 66^2 + 11028^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30714 + ... + 34446.

Almost surely, 2^121621140 is an apocalyptic number.

121621140 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 121621140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (185527524).

121621140 is an abundant number, since it is smaller than the sum of its proper divisors (249433908).

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

121621140 is a wasteful number, since it uses less digits than its factorization.

121621140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3929 (or 3924 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 121621140 is about 11028.1974955112. The cubic root of 121621140 is about 495.4536398460.

Adding to 121621140 its reverse (41126121), we get a palindrome (162747261).

The spelling of 121621140 in words is "one hundred twenty-one million, six hundred twenty-one thousand, one hundred forty".