27229721 has 2 divisors, whose sum is σ = 27229722. Its totient is φ = 27229720.

The previous prime is 27229711. The next prime is 27229747. The reversal of 27229721 is 12792272.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13980121 + 13249600 = 3739^2 + 3640^2 .

It is a cyclic number.

It is not a de Polignac number, because 27229721 - 2²² = 23035417 is a prime.

It is not a weakly prime, because it can be changed into another prime (27229711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13614860 + 13614861.

It is an arithmetic number, because the mean of its divisors is an integer number (13614861).

Almost surely, 2^27229721 is an apocalyptic number.

It is an amenable number.

27229721 is a deficient number, since it is larger than the sum of its proper divisors (1).

27229721 is an equidigital number, since it uses as much as digits as its factorization.

27229721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7056, while the sum is 32.

The square root of 27229721 is about 5218.2105170259. The cubic root of 27229721 is about 300.8484168860.

The spelling of 27229721 in words is "twenty-seven million, two hundred twenty-nine thousand, seven hundred twenty-one".