21420404400302 has 16 divisors (see below), whose sum is σ = 32229038550912. Its totient is φ = 10677439838520.

The previous prime is 21420404400293. The next prime is 21420404400319. The reversal of 21420404400302 is 20300440402412.

It is a happy number.

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 7 ways as a sum of consecutive naturals, for example, 11184218 + ... + 12958685.

It is an arithmetic number, because the mean of its divisors is an integer number (2014314909432).

Almost surely, 2^{21420404400302} is an apocalyptic number.

21420404400302 is a deficient number, since it is larger than the sum of its proper divisors (10808634150610).

21420404400302 is a wasteful number, since it uses less digits than its factorization.

21420404400302 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24144263.

The product of its (nonzero) digits is 6144, while the sum is 26.

Adding to 21420404400302 its reverse (20300440402412), we get a palindrome (41720844802714).

The spelling of 21420404400302 in words is "twenty-one trillion, four hundred twenty billion, four hundred four million, four hundred thousand, three hundred two".