11827770721 has 12 divisors (see below), whose sum is σ = 13220739840. Its totient is φ = 10565745840.

The previous prime is 11827770719. The next prime is 11827770737. The reversal of 11827770721 is 12707772811.

It is not a de Polignac number, because 11827770721 - 2¹ = 11827770719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11827770701) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1123581 + ... + 1134058.

It is an arithmetic number, because the mean of its divisors is an integer number (1101728320).

Almost surely, 2^11827770721 is an apocalyptic number.

It is an amenable number.

11827770721 is a deficient number, since it is larger than the sum of its proper divisors (1392969119).

11827770721 is a wasteful number, since it uses less digits than its factorization.

11827770721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2257696 (or 2257683 counting only the distinct ones).

The product of its (nonzero) digits is 76832, while the sum is 43.

The spelling of 11827770721 in words is "eleven billion, eight hundred twenty-seven million, seven hundred seventy thousand, seven hundred twenty-one".