21142331242 has 8 divisors (see below), whose sum is σ = 31863798432. Its totient is φ = 10521065100.

The previous prime is 21142331237. The next prime is 21142331311. The reversal of 21142331242 is 24213324112.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25049734 + ... + 25050577.

It is an arithmetic number, because the mean of its divisors is an integer number (3982974804).

Almost surely, 2^21142331242 is an apocalyptic number.

21142331242 is a deficient number, since it is larger than the sum of its proper divisors (10721467190).

21142331242 is a wasteful number, since it uses less digits than its factorization.

21142331242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50100524.

The product of its digits is 2304, while the sum is 25.

Adding to 21142331242 its reverse (24213324112), we get a palindrome (45355655354).

The spelling of 21142331242 in words is "twenty-one billion, one hundred forty-two million, three hundred thirty-one thousand, two hundred forty-two".