142121220 has 48 divisors (see below), whose sum is σ = 399567168. Its totient is φ = 37744000.

The previous prime is 142121219. The next prime is 142121251. The reversal of 142121220 is 22121241.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 142121220.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10342 + ... + 19778.

It is an arithmetic number, because the mean of its divisors is an integer number (8324316).

Almost surely, 2^142121220 is an apocalyptic number.

142121220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

142121220 is an abundant number, since it is smaller than the sum of its proper divisors (257445948).

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

142121220 is a wasteful number, since it uses less digits than its factorization.

142121220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9700 (or 9698 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 142121220 is about 11921.4604809981. The cubic root of 142121220 is about 521.8587571648.

Adding to 142121220 its reverse (22121241), we get a palindrome (164242461).

The spelling of 142121220 in words is "one hundred forty-two million, one hundred twenty-one thousand, two hundred twenty".