21013321442 has 8 divisors (see below), whose sum is σ = 32253005136. Its totient is φ = 10262319732.

The previous prime is 21013321429. The next prime is 21013321463. The reversal of 21013321442 is 24412331012.

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, 122170388 + ... + 122170559.

It is an arithmetic number, because the mean of its divisors is an integer number (4031625642).

Almost surely, 2^21013321442 is an apocalyptic number.

21013321442 is a deficient number, since it is larger than the sum of its proper divisors (11239683694).

21013321442 is a wasteful number, since it uses less digits than its factorization.

21013321442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244340992.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21013321442 its reverse (24412331012), we get a palindrome (45425652454).

The spelling of 21013321442 in words is "twenty-one billion, thirteen million, three hundred twenty-one thousand, four hundred forty-two".