221744413 has 16 divisors (see below), whose sum is σ = 258177024. Its totient is φ = 188213760.

The previous prime is 221744407. The next prime is 221744417. The reversal of 221744413 is 314447122.

It is a cyclic number.

It is not a de Polignac number, because 221744413 - 2⁹ = 221743901 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 (221744417) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19081 + ... + 28417.

It is an arithmetic number, because the mean of its divisors is an integer number (16136064).

Almost surely, 2^221744413 is an apocalyptic number.

It is an amenable number.

221744413 is a deficient number, since it is larger than the sum of its proper divisors (36432611).

221744413 is a wasteful number, since it uses less digits than its factorization.

221744413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9492.

The product of its digits is 5376, while the sum is 28.

The square root of 221744413 is about 14891.0850175533. The cubic root of 221744413 is about 605.2724342779.

The spelling of 221744413 in words is "two hundred twenty-one million, seven hundred forty-four thousand, four hundred thirteen".