13402249921 has 4 divisors (see below), whose sum is σ = 13864396500. Its totient is φ = 12940103344.

The previous prime is 13402249841. The next prime is 13402249943. The reversal of 13402249921 is 12994220431.

13402249921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2635282225 + 10766967696 = 51335^2 + 103764^2 .

It is a cyclic number.

It is not a de Polignac number, because 13402249921 - 2¹⁹ = 13401725633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13402249321) 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 3 ways as a sum of consecutive naturals, for example, 231073246 + ... + 231073303.

It is an arithmetic number, because the mean of its divisors is an integer number (3466099125).

Almost surely, 2^13402249921 is an apocalyptic number.

It is an amenable number.

13402249921 is a deficient number, since it is larger than the sum of its proper divisors (462146579).

13402249921 is an equidigital number, since it uses as much as digits as its factorization.

13402249921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 462146578.

The product of its (nonzero) digits is 31104, while the sum is 37.

The spelling of 13402249921 in words is "thirteen billion, four hundred two million, two hundred forty-nine thousand, nine hundred twenty-one".