221254009 has 2 divisors, whose sum is σ = 221254010. Its totient is φ = 221254008.

The previous prime is 221254003. The next prime is 221254039. The reversal of 221254009 is 900452122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 153685609 + 67568400 = 12397^2 + 8220^2 .

It is a cyclic number.

It is not a de Polignac number, because 221254009 - 2⁷ = 221253881 is a prime.

It is not a weakly prime, because it can be changed into another prime (221254003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110627004 + 110627005.

It is an arithmetic number, because the mean of its divisors is an integer number (110627005).

Almost surely, 2^221254009 is an apocalyptic number.

It is an amenable number.

221254009 is a deficient number, since it is larger than the sum of its proper divisors (1).

221254009 is an equidigital number, since it uses as much as digits as its factorization.

221254009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 221254009 is about 14874.6095410938. The cubic root of 221254009 is about 604.8259035069.

The spelling of 221254009 in words is "two hundred twenty-one million, two hundred fifty-four thousand, nine".