27020721799 has 4 divisors (see below), whose sum is σ = 27288253800. Its totient is φ = 26753189800.

The previous prime is 27020721719. The next prime is 27020721817. The reversal of 27020721799 is 99712702072.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 27020721799 - 2¹³ = 27020713607 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 (27020721709) 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, 133765849 + ... + 133766050.

It is an arithmetic number, because the mean of its divisors is an integer number (6822063450).

Almost surely, 2^27020721799 is an apocalyptic number.

27020721799 is a deficient number, since it is larger than the sum of its proper divisors (267532001).

27020721799 is a wasteful number, since it uses less digits than its factorization.

27020721799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267532000.

The product of its (nonzero) digits is 222264, while the sum is 46.

The spelling of 27020721799 in words is "twenty-seven billion, twenty million, seven hundred twenty-one thousand, seven hundred ninety-nine".