221464613 has 2 divisors, whose sum is σ = 221464614. Its totient is φ = 221464612.

The previous prime is 221464601. The next prime is 221464693. The reversal of 221464613 is 316464122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 217208644 + 4255969 = 14738^2 + 2063^2 .

It is a cyclic number.

It is not a de Polignac number, because 221464613 - 2⁴ = 221464597 is a prime.

It is a super-2 number, since 2×221464613² = 98093149622479538, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221464693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110732306 + 110732307.

It is an arithmetic number, because the mean of its divisors is an integer number (110732307).

Almost surely, 2^221464613 is an apocalyptic number.

It is an amenable number.

221464613 is a deficient number, since it is larger than the sum of its proper divisors (1).

221464613 is an equidigital number, since it uses as much as digits as its factorization.

221464613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 29.

The square root of 221464613 is about 14881.6871691351. The cubic root of 221464613 is about 605.0177469010.

The spelling of 221464613 in words is "two hundred twenty-one million, four hundred sixty-four thousand, six hundred thirteen".