121505142 has 32 divisors (see below), whose sum is σ = 268744320. Its totient is φ = 36313920.

The previous prime is 121505141. The next prime is 121505147. The reversal of 121505142 is 241505121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121505141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7792 + ... + 17427.

It is an arithmetic number, because the mean of its divisors is an integer number (8398260).

Almost surely, 2^121505142 is an apocalyptic number.

121505142 is an abundant number, since it is smaller than the sum of its proper divisors (147239178).

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

121505142 is a wasteful number, since it uses less digits than its factorization.

121505142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25308.

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 121505142 is about 11022.9370859132. The cubic root of 121505142 is about 495.2960742767.

Subtracting from 121505142 its sum of digits (21), we obtain a palindrome (121505121).

The spelling of 121505142 in words is "one hundred twenty-one million, five hundred five thousand, one hundred forty-two".