121640142 has 32 divisors (see below), whose sum is σ = 262715040. Its totient is φ = 37324800.

The previous prime is 121640137. The next prime is 121640159. The reversal of 121640142 is 241046121.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29334 + ... + 33222.

It is an arithmetic number, because the mean of its divisors is an integer number (8209845).

Almost surely, 2^121640142 is an apocalyptic number.

121640142 is an abundant number, since it is smaller than the sum of its proper divisors (141074898).

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

121640142 is a wasteful number, since it uses less digits than its factorization.

121640142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4308.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 121640142 is about 11029.0589807109. The cubic root of 121640142 is about 495.4794416099.

Adding to 121640142 its reverse (241046121), we get a palindrome (362686263).

The spelling of 121640142 in words is "one hundred twenty-one million, six hundred forty thousand, one hundred forty-two".