13249409821 has 8 divisors (see below), whose sum is σ = 13949640320. Its totient is φ = 12549468672.

The previous prime is 13249409819. The next prime is 13249409837. The reversal of 13249409821 is 12890494231.

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

It is a cyclic number.

It is not a de Polignac number, because 13249409821 - 2¹ = 13249409819 is a prime.

It is a super-2 number, since 2×13249409821² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13249409861) 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, 25036 + ... + 164698.

It is an arithmetic number, because the mean of its divisors is an integer number (1743705040).

Almost surely, 2^13249409821 is an apocalyptic number.

It is an amenable number.

13249409821 is a deficient number, since it is larger than the sum of its proper divisors (700230499).

13249409821 is a wasteful number, since it uses less digits than its factorization.

13249409821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144675.

The product of its (nonzero) digits is 124416, while the sum is 43.

The spelling of 13249409821 in words is "thirteen billion, two hundred forty-nine million, four hundred nine thousand, eight hundred twenty-one".