11715902021 has 16 divisors (see below), whose sum is σ = 11903516784. Its totient is φ = 11530197504.

The previous prime is 11715901969. The next prime is 11715902041. The reversal of 11715902021 is 12020951711.

It is a happy number.

11715902021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 473541121 + 11242360900 = 21761^2 + 106030^2 .

It is a cyclic number.

It is not a de Polignac number, because 11715902021 - 2⁶ = 11715901957 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 (11715902041) 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, 15476375 + ... + 15477131.

It is an arithmetic number, because the mean of its divisors is an integer number (743969799).

Almost surely, 2^11715902021 is an apocalyptic number.

It is an amenable number.

11715902021 is a deficient number, since it is larger than the sum of its proper divisors (187614763).

11715902021 is a wasteful number, since it uses less digits than its factorization.

11715902021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1720.

The product of its (nonzero) digits is 1260, while the sum is 29.

The spelling of 11715902021 in words is "eleven billion, seven hundred fifteen million, nine hundred two thousand, twenty-one".