13403221421 has 16 divisors (see below), whose sum is σ = 13992620400. Its totient is φ = 12822663168.

The previous prime is 13403221387. The next prime is 13403221423. The reversal of 13403221421 is 12412230431.

It can be written as a sum of positive squares in 8 ways, for example, as 2037529321 + 11365692100 = 45139^2 + 106610^2 .

It is a cyclic number.

It is not a de Polignac number, because 13403221421 - 2²⁶ = 13336112557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13403221423) 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, 2353145 + ... + 2358833.

It is an arithmetic number, because the mean of its divisors is an integer number (874538775).

Almost surely, 2^13403221421 is an apocalyptic number.

It is an amenable number.

13403221421 is a deficient number, since it is larger than the sum of its proper divisors (589398979).

13403221421 is a wasteful number, since it uses less digits than its factorization.

13403221421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6448.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 13403221421 its reverse (12412230431), we get a palindrome (25815451852).

The spelling of 13403221421 in words is "thirteen billion, four hundred three million, two hundred twenty-one thousand, four hundred twenty-one".