8867942721 has 32 divisors (see below), whose sum is σ = 14955171840. Its totient is φ = 5140832400.

The previous prime is 8867942719. The next prime is 8867942723. The reversal of 8867942721 is 1272497688.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (8867942719) and next prime (8867942723).

It is not a de Polignac number, because 8867942721 - 2¹ = 8867942719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8867942723) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 642265 + ... + 655926.

It is an arithmetic number, because the mean of its divisors is an integer number (467349120).

Almost surely, 2^8867942721 is an apocalyptic number.

It is an amenable number.

8867942721 is a deficient number, since it is larger than the sum of its proper divisors (6087229119).

8867942721 is a wasteful number, since it uses less digits than its factorization.

8867942721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1298234 (or 1298228 counting only the distinct ones).

The product of its digits is 2709504, while the sum is 54.

The square root of 8867942721 is about 94169.7548101300. The cubic root of 8867942721 is about 2069.8599422146.

The spelling of 8867942721 in words is "eight billion, eight hundred sixty-seven million, nine hundred forty-two thousand, seven hundred twenty-one".