13791797421 has 24 divisors (see below), whose sum is σ = 19162800384. Its totient is φ = 8814095040.

The previous prime is 13791797419. The next prime is 13791797431. The reversal of 13791797421 is 12479719731.

It is not a de Polignac number, because 13791797421 - 2¹ = 13791797419 is a prime.

It is a super-2 number, since 2×13791797421² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13791797401) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1058281 + ... + 1071233.

It is an arithmetic number, because the mean of its divisors is an integer number (798450016).

Almost surely, 2^13791797421 is an apocalyptic number.

It is an amenable number.

13791797421 is a deficient number, since it is larger than the sum of its proper divisors (5371002963).

13791797421 is a wasteful number, since it uses less digits than its factorization.

13791797421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13201 (or 13094 counting only the distinct ones).

The product of its digits is 666792, while the sum is 51.

The spelling of 13791797421 in words is "thirteen billion, seven hundred ninety-one million, seven hundred ninety-seven thousand, four hundred twenty-one".