2142120242 has 4 divisors (see below), whose sum is σ = 3213180366. Its totient is φ = 1071060120.

The previous prime is 2142120229. The next prime is 2142120247. The reversal of 2142120242 is 2420212412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1353577681 + 788542561 = 36791^2 + 28081^2 .

It is a super-2 number, since 2×2142120242² = 9177358262372277128, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2142120247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 535530059 + ... + 535530062.

Almost surely, 2^2142120242 is an apocalyptic number.

2142120242 is a deficient number, since it is larger than the sum of its proper divisors (1071060124).

2142120242 is a wasteful number, since it uses less digits than its factorization.

2142120242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1071060123.

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 2142120242 is about 46283.0448652636. The cubic root of 2142120242 is about 1289.0841890434.

Adding to 2142120242 its reverse (2420212412), we get a palindrome (4562332654).

The spelling of 2142120242 in words is "two billion, one hundred forty-two million, one hundred twenty thousand, two hundred forty-two".