121442540 has 24 divisors (see below), whose sum is σ = 256510800. Its totient is φ = 48294848.

The previous prime is 121442491. The next prime is 121442549. The reversal of 121442540 is 45244121.

It is not an unprimeable number, because it can be changed into a prime (121442549) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14090 + ... + 21009.

It is an arithmetic number, because the mean of its divisors is an integer number (10687950).

Almost surely, 2^121442540 is an apocalyptic number.

121442540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121442540 is an abundant number, since it is smaller than the sum of its proper divisors (135068260).

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

121442540 is a wasteful number, since it uses less digits than its factorization.

121442540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35281 (or 35279 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 121442540 is about 11020.0970957610. The cubic root of 121442540 is about 495.2109973521.

Adding to 121442540 its reverse (45244121), we get a palindrome (166686661).

The spelling of 121442540 in words is "one hundred twenty-one million, four hundred forty-two thousand, five hundred forty".