2142157 has 4 divisors (see below), whose sum is σ = 2151360. Its totient is φ = 2132956.

The previous prime is 2142149. The next prime is 2142163. The reversal of 2142157 is 7512412.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2142157 - 2³ = 2142149 is a prime.

It is a super-2 number, since 2×2142157² = 9177673225298, which contains 22 as substring.

It is a Duffinian number.

2142157 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2142167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4243 + ... + 4720.

It is an arithmetic number, because the mean of its divisors is an integer number (537840).

2^2142157 is an apocalyptic number.

It is an amenable number.

2142157 is a deficient number, since it is larger than the sum of its proper divisors (9203).

2142157 is an equidigital number, since it uses as much as digits as its factorization.

2142157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9202.

The product of its digits is 560, while the sum is 22.

The square root of 2142157 is about 1463.6109455726. The cubic root of 2142157 is about 128.9091562406.

Adding to 2142157 its reverse (7512412), we get a palindrome (9654569).

The spelling of 2142157 in words is "two million, one hundred forty-two thousand, one hundred fifty-seven".