2142423181 has 6 divisors (see below), whose sum is σ = 2275861610. Its totient is φ = 2016398016.

The previous prime is 2142423167. The next prime is 2142423193. The reversal of 2142423181 is 1813242412.

It can be written as a sum of positive squares in 3 ways, for example, as 733922281 + 1408500900 = 27091^2 + 37530^2 .

It is not a de Polignac number, because 2142423181 - 2⁵ = 2142423149 is a prime.

It is a super-2 number, since 2×2142423181² = 9179954172972317522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2142423581) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3706326 + ... + 3706903.

Almost surely, 2^2142423181 is an apocalyptic number.

It is an amenable number.

2142423181 is a deficient number, since it is larger than the sum of its proper divisors (133438429).

2142423181 is an equidigital number, since it uses as much as digits as its factorization.

2142423181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7413263 (or 7413246 counting only the distinct ones).

The product of its digits is 3072, while the sum is 28.

The square root of 2142423181 is about 46286.3174275077. The cubic root of 2142423181 is about 1289.1449536790.

Adding to 2142423181 its reverse (1813242412), we get a palindrome (3955665593).

The spelling of 2142423181 in words is "two billion, one hundred forty-two million, four hundred twenty-three thousand, one hundred eighty-one".