2673257721 has 4 divisors (see below), whose sum is σ = 3564343632. Its totient is φ = 1782171812.

The previous prime is 2673257647. The next prime is 2673257747. The reversal of 2673257721 is 1277523762.

It is a happy number.

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 not a de Polignac number, because 2673257721 - 2²³ = 2664869113 is a prime.

It is a super-2 number, since 2×2673257721² = 14292613685772227682, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2673257791) 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, 445542951 + ... + 445542956.

It is an arithmetic number, because the mean of its divisors is an integer number (891085908).

Almost surely, 2^2673257721 is an apocalyptic number.

It is an amenable number.

2673257721 is a deficient number, since it is larger than the sum of its proper divisors (891085911).

2673257721 is an equidigital number, since it uses as much as digits as its factorization.

2673257721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 891085910.

The product of its digits is 246960, while the sum is 42.

The square root of 2673257721 is about 51703.5561736328. The cubic root of 2673257721 is about 1387.8641041684.

The spelling of 2673257721 in words is "two billion, six hundred seventy-three million, two hundred fifty-seven thousand, seven hundred twenty-one".