11513683821 has 24 divisors (see below), whose sum is σ = 16241389920. Its totient is φ = 7254159264.

The previous prime is 11513683817. The next prime is 11513683829. The reversal of 11513683821 is 12838631511.

It is not a de Polignac number, because 11513683821 - 2² = 11513683817 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11513683821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11513683829) 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, 441091 + ... + 466463.

It is an arithmetic number, because the mean of its divisors is an integer number (676724580).

Almost surely, 2^11513683821 is an apocalyptic number.

It is an amenable number.

11513683821 is a deficient number, since it is larger than the sum of its proper divisors (4727706099).

11513683821 is a wasteful number, since it uses less digits than its factorization.

11513683821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25833 (or 25814 counting only the distinct ones).

The product of its digits is 34560, while the sum is 39.

The spelling of 11513683821 in words is "eleven billion, five hundred thirteen million, six hundred eighty-three thousand, eight hundred twenty-one".