27221993 has 4 divisors (see below), whose sum is σ = 27323460. Its totient is φ = 27120528.

The previous prime is 27221989. The next prime is 27222001. The reversal of 27221993 is 39912272.

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

It can be written as a sum of positive squares in 2 ways, for example, as 12759184 + 14462809 = 3572^2 + 3803^2 .

It is a cyclic number.

It is not a de Polignac number, because 27221993 - 2² = 27221989 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27221393) 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, 50330 + ... + 50867.

It is an arithmetic number, because the mean of its divisors is an integer number (6830865).

Almost surely, 2^27221993 is an apocalyptic number.

It is an amenable number.

27221993 is a deficient number, since it is larger than the sum of its proper divisors (101467).

27221993 is a wasteful number, since it uses less digits than its factorization.

27221993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101466.

The product of its digits is 13608, while the sum is 35.

The square root of 27221993 is about 5217.4699807474. The cubic root of 27221993 is about 300.8199531772.

The spelling of 27221993 in words is "twenty-seven million, two hundred twenty-one thousand, nine hundred ninety-three".