2142040421 has 8 divisors (see below), whose sum is σ = 2204070264. Its totient is φ = 2080811200.

The previous prime is 2142040403. The next prime is 2142040429. The reversal of 2142040421 is 1240402412.

It can be written as a sum of positive squares in 4 ways, for example, as 1608892321 + 533148100 = 40111^2 + 23090^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2142040421 - 2³⁰ = 1068298597 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2142040393 and 2142040402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2142040429) 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, 194726 + ... + 205431.

It is an arithmetic number, because the mean of its divisors is an integer number (275508783).

Almost surely, 2^2142040421 is an apocalyptic number.

It is an amenable number.

2142040421 is a deficient number, since it is larger than the sum of its proper divisors (62029843).

2142040421 is a wasteful number, since it uses less digits than its factorization.

2142040421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400311.

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

The square root of 2142040421 is about 46282.1825436096. The cubic root of 2142040421 is about 1289.0681772956.

Adding to 2142040421 its reverse (1240402412), we get a palindrome (3382442833).

The spelling of 2142040421 in words is "two billion, one hundred forty-two million, forty thousand, four hundred twenty-one".