13135765621 has 8 divisors (see below), whose sum is σ = 14372452224. Its totient is φ = 11906166720.

The previous prime is 13135765619. The next prime is 13135765633. The reversal of 13135765621 is 12656753131.

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 13135765621 - 2¹ = 13135765619 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13135765661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1768045 + ... + 1775458.

It is an arithmetic number, because the mean of its divisors is an integer number (1796556528).

Almost surely, 2^13135765621 is an apocalyptic number.

13135765621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13135765621 is a deficient number, since it is larger than the sum of its proper divisors (1236686603).

13135765621 is a wasteful number, since it uses less digits than its factorization.

13135765621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3543851.

The product of its digits is 113400, while the sum is 40.

The spelling of 13135765621 in words is "thirteen billion, one hundred thirty-five million, seven hundred sixty-five thousand, six hundred twenty-one".