21142230442 has 8 divisors (see below), whose sum is σ = 31714005600. Its totient is φ = 10570895244.

The previous prime is 21142230427. The next prime is 21142230463. The reversal of 21142230442 is 24403224112.

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, 67309 + ... + 216367.

It is an arithmetic number, because the mean of its divisors is an integer number (3964250700).

Almost surely, 2^21142230442 is an apocalyptic number.

21142230442 is a deficient number, since it is larger than the sum of its proper divisors (10571775158).

21142230442 is a wasteful number, since it uses less digits than its factorization.

21142230442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219980.

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 21142230442 its reverse (24403224112), we get a palindrome (45545454554).

The spelling of 21142230442 in words is "twenty-one billion, one hundred forty-two million, two hundred thirty thousand, four hundred forty-two".