142121140 has 144 divisors (see below), whose sum is σ = 379048320. Its totient is φ = 43718400.

The previous prime is 142121131. The next prime is 142121153. The reversal of 142121140 is 41121241.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1407090 + ... + 1407190.

It is an arithmetic number, because the mean of its divisors is an integer number (2632280).

Almost surely, 2^142121140 is an apocalyptic number.

142121140 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 142121140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (189524160).

142121140 is an abundant number, since it is smaller than the sum of its proper divisors (236927180).

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

142121140 is a wasteful number, since it uses less digits than its factorization.

142121140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182 (or 157 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 142121140 is about 11921.4571257041. The cubic root of 142121140 is about 521.8586592467.

Adding to 142121140 its reverse (41121241), we get a palindrome (183242381).

The spelling of 142121140 in words is "one hundred forty-two million, one hundred twenty-one thousand, one hundred forty".