221634713 has 4 divisors (see below), whose sum is σ = 221668788. Its totient is φ = 221600640.

The previous prime is 221634709. The next prime is 221634719. The reversal of 221634713 is 317436122.

It is a happy number.

221634713 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 186267904 + 35366809 = 13648^2 + 5947^2 .

It is a cyclic number.

It is not a de Polignac number, because 221634713 - 2² = 221634709 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221634719) 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, 3908 + ... + 21413.

It is an arithmetic number, because the mean of its divisors is an integer number (55417197).

Almost surely, 2^221634713 is an apocalyptic number.

It is an amenable number.

221634713 is a deficient number, since it is larger than the sum of its proper divisors (34075).

221634713 is an equidigital number, since it uses as much as digits as its factorization.

221634713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34074.

The product of its digits is 6048, while the sum is 29.

The square root of 221634713 is about 14887.4011499657. The cubic root of 221634713 is about 605.1726056245.

The spelling of 221634713 in words is "two hundred twenty-one million, six hundred thirty-four thousand, seven hundred thirteen".