21342340442 has 8 divisors (see below), whose sum is σ = 32373213300. Its totient is φ = 10551269344.

The previous prime is 21342340433. The next prime is 21342340451. The reversal of 21342340442 is 24404324312.

It is an interprime number because it is at equal distance from previous prime (21342340433) and next prime (21342340451).

It can be written as a sum of positive squares in 2 ways, for example, as 17105762521 + 4236577921 = 130789^2 + 65089^2 .

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, 59950217 + ... + 59950572.

Almost surely, 2^21342340442 is an apocalyptic number.

21342340442 is a deficient number, since it is larger than the sum of its proper divisors (11030872858).

21342340442 is a wasteful number, since it uses less digits than its factorization.

21342340442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119900880.

The product of its (nonzero) digits is 18432, while the sum is 29.

Adding to 21342340442 its reverse (24404324312), we get a palindrome (45746664754).

The spelling of 21342340442 in words is "twenty-one billion, three hundred forty-two million, three hundred forty thousand, four hundred forty-two".