13221400421 has 16 divisors (see below), whose sum is σ = 13739174400. Its totient is φ = 12713500800.

The previous prime is 13221400403. The next prime is 13221400427. The reversal of 13221400421 is 12400412231.

It is a cyclic number.

It is not a de Polignac number, because 13221400421 - 2¹⁴ = 13221384037 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13221400393 and 13221400402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13221400427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2040575 + ... + 2047043.

It is an arithmetic number, because the mean of its divisors is an integer number (858698400).

Almost surely, 2^13221400421 is an apocalyptic number.

It is an amenable number.

13221400421 is a deficient number, since it is larger than the sum of its proper divisors (517773979).

13221400421 is an equidigital number, since it uses as much as digits as its factorization.

13221400421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7220.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 13221400421 its reverse (12400412231), we get a palindrome (25621812652).

The spelling of 13221400421 in words is "thirteen billion, two hundred twenty-one million, four hundred thousand, four hundred twenty-one".