21420401322 has 16 divisors (see below), whose sum is σ = 42916903200. Its totient is φ = 7127450352.

The previous prime is 21420401269. The next prime is 21420401323. The reversal of 21420401322 is 22310402412.

It is not an unprimeable number, because it can be changed into a prime (21420401323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3167197 + ... + 3173952.

It is an arithmetic number, because the mean of its divisors is an integer number (2682306450).

Almost surely, 2^21420401322 is an apocalyptic number.

21420401322 is an abundant number, since it is smaller than the sum of its proper divisors (21496501878).

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

21420401322 is a wasteful number, since it uses less digits than its factorization.

21420401322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6341717.

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 21420401322 its reverse (22310402412), we get a palindrome (43730803734).

The spelling of 21420401322 in words is "twenty-one billion, four hundred twenty million, four hundred one thousand, three hundred twenty-two".