27172136821 has 8 divisors (see below), whose sum is σ = 27528698880. Its totient is φ = 26815890192.

The previous prime is 27172136807. The next prime is 27172136851. The reversal of 27172136821 is 12863127172.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 27172136821 - 2⁹ = 27172136309 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 (27172136801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97116 + ... + 252538.

It is an arithmetic number, because the mean of its divisors is an integer number (3441087360).

Almost surely, 2^27172136821 is an apocalyptic number.

It is an amenable number.

27172136821 is a deficient number, since it is larger than the sum of its proper divisors (356562059).

27172136821 is a wasteful number, since it uses less digits than its factorization.

27172136821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157715.

The product of its digits is 56448, while the sum is 40.

The spelling of 27172136821 in words is "twenty-seven billion, one hundred seventy-two million, one hundred thirty-six thousand, eight hundred twenty-one".