27773602021 has 6 divisors (see below), whose sum is σ = 30528008966. Its totient is φ = 25248729000.

The previous prime is 27773602019. The next prime is 27773602027. The reversal of 27773602021 is 12020637772.

It can be written as a sum of positive squares in only one way, i.e., 25268599521 + 2505002500 = 158961^2 + 50050^2 .

It is not a de Polignac number, because 27773602021 - 2¹ = 27773602019 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 (27773602027) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 114766830 + ... + 114767071.

Almost surely, 2^27773602021 is an apocalyptic number.

It is an amenable number.

27773602021 is a deficient number, since it is larger than the sum of its proper divisors (2754406945).

27773602021 is a wasteful number, since it uses less digits than its factorization.

27773602021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229533923 (or 229533912 counting only the distinct ones).

The product of its (nonzero) digits is 49392, while the sum is 37.

The spelling of 27773602021 in words is "twenty-seven billion, seven hundred seventy-three million, six hundred two thousand, twenty-one".