13451692821 has 8 divisors (see below), whose sum is σ = 20497817664. Its totient is φ = 7686681600.

The previous prime is 13451692819. The next prime is 13451692841. The reversal of 13451692821 is 12829615431.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13451692821 - 2¹ = 13451692819 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13451692811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 320278380 + ... + 320278421.

It is an arithmetic number, because the mean of its divisors is an integer number (2562227208).

Almost surely, 2^13451692821 is an apocalyptic number.

It is an amenable number.

13451692821 is a deficient number, since it is larger than the sum of its proper divisors (7046124843).

13451692821 is an equidigital number, since it uses as much as digits as its factorization.

13451692821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640556811.

The product of its digits is 103680, while the sum is 42.

The spelling of 13451692821 in words is "thirteen billion, four hundred fifty-one million, six hundred ninety-two thousand, eight hundred twenty-one".