13672987421 has 2 divisors, whose sum is σ = 13672987422. Its totient is φ = 13672987420.

The previous prime is 13672987411. The next prime is 13672987429. The reversal of 13672987421 is 12478927631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13327548025 + 345439396 = 115445^2 + 18586^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13672987421 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13672987421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13672987429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6836493710 + 6836493711.

It is an arithmetic number, because the mean of its divisors is an integer number (6836493711).

Almost surely, 2^13672987421 is an apocalyptic number.

It is an amenable number.

13672987421 is a deficient number, since it is larger than the sum of its proper divisors (1).

13672987421 is an equidigital number, since it uses as much as digits as its factorization.

13672987421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1016064, while the sum is 50.

The spelling of 13672987421 in words is "thirteen billion, six hundred seventy-two million, nine hundred eighty-seven thousand, four hundred twenty-one".