27291020021 has 16 divisors (see below), whose sum is σ = 27674395200. Its totient is φ = 26910968448.

The previous prime is 27291020017. The next prime is 27291020039. The reversal of 27291020021 is 12002019272.

It is a cyclic number.

It is not a de Polignac number, because 27291020021 - 2² = 27291020017 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 (27291920021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26781650 + ... + 26782668.

It is an arithmetic number, because the mean of its divisors is an integer number (1729649700).

Almost surely, 2^27291020021 is an apocalyptic number.

It is an amenable number.

27291020021 is a deficient number, since it is larger than the sum of its proper divisors (383375179).

27291020021 is a wasteful number, since it uses less digits than its factorization.

27291020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2308.

The product of its (nonzero) digits is 1008, while the sum is 26.

Adding to 27291020021 its reverse (12002019272), we get a palindrome (39293039293).

The spelling of 27291020021 in words is "twenty-seven billion, two hundred ninety-one million, twenty thousand, twenty-one".