27453123721 has 4 divisors (see below), whose sum is σ = 27454603792. Its totient is φ = 27451643652.

The previous prime is 27453123707. The next prime is 27453123739. The reversal of 27453123721 is 12732135472.

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 27453123721 - 2⁵ = 27453123689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27453123791) 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, 711855 + ... + 749428.

It is an arithmetic number, because the mean of its divisors is an integer number (6863650948).

Almost surely, 2^27453123721 is an apocalyptic number.

It is an amenable number.

27453123721 is a deficient number, since it is larger than the sum of its proper divisors (1480071).

27453123721 is a wasteful number, since it uses less digits than its factorization.

27453123721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1480070.

The product of its digits is 70560, while the sum is 37.

The spelling of 27453123721 in words is "twenty-seven billion, four hundred fifty-three million, one hundred twenty-three thousand, seven hundred twenty-one".