21404220342 has 32 divisors (see below), whose sum is σ = 44168302080. Its totient is φ = 6911505120.

The previous prime is 21404220301. The next prime is 21404220367. The reversal of 21404220342 is 24302240412.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 400884 + ... + 451127.

It is an arithmetic number, because the mean of its divisors is an integer number (1380259440).

Almost surely, 2^21404220342 is an apocalyptic number.

21404220342 is an abundant number, since it is smaller than the sum of its proper divisors (22764081738).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21404220342 is a wasteful number, since it uses less digits than its factorization.

21404220342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 852148.

The product of its (nonzero) digits is 3072, while the sum is 24.

Adding to 21404220342 its reverse (24302240412), we get a palindrome (45706460754).

The spelling of 21404220342 in words is "twenty-one billion, four hundred four million, two hundred twenty thousand, three hundred forty-two".