142221220 has 24 divisors (see below), whose sum is σ = 308964600. Its totient is φ = 54926592.

The previous prime is 142221203. The next prime is 142221221. The reversal of 142221220 is 22122241.

142221220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 13307904 + 128913316 = 3648^2 + 11354^2 .

It is a junction number, because it is equal to n+sod(n) for n = 142221194 and 142221203.

It is not an unprimeable number, because it can be changed into a prime (142221221) 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, 122025 + ... + 123184.

It is an arithmetic number, because the mean of its divisors is an integer number (12873525).

Almost surely, 2^142221220 is an apocalyptic number.

142221220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

142221220 is an abundant number, since it is smaller than the sum of its proper divisors (166743380).

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

142221220 is a wasteful number, since it uses less digits than its factorization.

142221220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245247 (or 245245 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 142221220 is about 11925.6538604808. The cubic root of 142221220 is about 521.9811260382.

Adding to 142221220 its reverse (22122241), we get a palindrome (164343461).

The spelling of 142221220 in words is "one hundred forty-two million, two hundred twenty-one thousand, two hundred twenty".