1142122220 has 36 divisors (see below), whose sum is σ = 2547854400. Its totient is φ = 429973248.

The previous prime is 1142122217. The next prime is 1142122229. The reversal of 1142122220 is 222212411.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is not an unprimeable number, because it can be changed into a prime (1142122229) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 93020 + ... + 104579.

Almost surely, 2^1142122220 is an apocalyptic number.

1142122220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1142122220 is an abundant number, since it is smaller than the sum of its proper divisors (1405732180).

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

1142122220 is a wasteful number, since it uses less digits than its factorization.

1142122220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197642 (or 197623 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 1142122220 is about 33795.2987854820. The cubic root of 1142122220 is about 1045.2917601433.

Adding to 1142122220 its reverse (222212411), we get a palindrome (1364334631).

The spelling of 1142122220 in words is "one billion, one hundred forty-two million, one hundred twenty-two thousand, two hundred twenty".