21321204142 has 8 divisors (see below), whose sum is σ = 36550635696. Its totient is φ = 9137658912.

The previous prime is 21321204137. The next prime is 21321204167. The reversal of 21321204142 is 24140212312.

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

It is a congruent number.

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, 761471563 + ... + 761471590.

It is an arithmetic number, because the mean of its divisors is an integer number (4568829462).

Almost surely, 2^21321204142 is an apocalyptic number.

21321204142 is a deficient number, since it is larger than the sum of its proper divisors (15229431554).

21321204142 is a wasteful number, since it uses less digits than its factorization.

21321204142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1522943162.

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 21321204142 its reverse (24140212312), we get a palindrome (45461416454).

The spelling of 21321204142 in words is "twenty-one billion, three hundred twenty-one million, two hundred four thousand, one hundred forty-two".