7721867260721 has 4 divisors (see below), whose sum is σ = 7819612416000. Its totient is φ = 7624122105444.

The previous prime is 7721867260697. The next prime is 7721867260733. The reversal of 7721867260721 is 1270627681277.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7721867260721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7721867260781) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48872577521 + ... + 48872577678.

It is an arithmetic number, because the mean of its divisors is an integer number (1954903104000).

Almost surely, 2^{7721867260721} is an apocalyptic number.

It is an amenable number.

7721867260721 is a deficient number, since it is larger than the sum of its proper divisors (97745155279).

7721867260721 is an equidigital number, since it uses as much as digits as its factorization.

7721867260721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97745155278.

The product of its (nonzero) digits is 5531904, while the sum is 56.

The spelling of 7721867260721 in words is "seven trillion, seven hundred twenty-one billion, eight hundred sixty-seven million, two hundred sixty thousand, seven hundred twenty-one".