11712765021 has 16 divisors (see below), whose sum is σ = 16162675200. Its totient is φ = 7535920448.

The previous prime is 11712764971. The next prime is 11712765041. The reversal of 11712765021 is 12056721711.

11712765021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 11712765021 - 2¹¹ = 11712762973 is a prime.

It is a super-2 number, since 2×11712765021² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11712765041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 176500 + ... + 233618.

It is an arithmetic number, because the mean of its divisors is an integer number (1010167200).

Almost surely, 2^11712765021 is an apocalyptic number.

It is an amenable number.

11712765021 is a deficient number, since it is larger than the sum of its proper divisors (4449910179).

11712765021 is a wasteful number, since it uses less digits than its factorization.

11712765021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59508.

The product of its (nonzero) digits is 5880, while the sum is 33.

The spelling of 11712765021 in words is "eleven billion, seven hundred twelve million, seven hundred sixty-five thousand, twenty-one".