21204400142 has 8 divisors (see below), whose sum is σ = 31982327832. Its totient is φ = 10543624200.

The previous prime is 21204400123. The next prime is 21204400163. The reversal of 21204400142 is 24100440212.

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 pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29287484 + ... + 29288207.

It is an arithmetic number, because the mean of its divisors is an integer number (3997790979).

Almost surely, 2^21204400142 is an apocalyptic number.

21204400142 is a deficient number, since it is larger than the sum of its proper divisors (10777927690).

21204400142 is a wasteful number, since it uses less digits than its factorization.

21204400142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58575874.

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 21204400142 its reverse (24100440212), we get a palindrome (45304840354).

The spelling of 21204400142 in words is "twenty-one billion, two hundred four million, four hundred thousand, one hundred forty-two".