221559047 has 4 divisors (see below), whose sum is σ = 221994840. Its totient is φ = 221123256.

The previous prime is 221559029. The next prime is 221559049. The reversal of 221559047 is 740955122.

221559047 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 is a cyclic number.

It is not a de Polignac number, because 221559047 - 2²⁴ = 204781831 is a prime.

It is a super-2 number, since 2×221559047² = 98176822615096418, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221558998 and 221559016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221559049) 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, 217133 + ... + 218150.

It is an arithmetic number, because the mean of its divisors is an integer number (55498710).

Almost surely, 2^221559047 is an apocalyptic number.

221559047 is a deficient number, since it is larger than the sum of its proper divisors (435793).

221559047 is an equidigital number, since it uses as much as digits as its factorization.

221559047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435792.

The product of its (nonzero) digits is 25200, while the sum is 35.

The square root of 221559047 is about 14884.8596567116. The cubic root of 221559047 is about 605.1037292261.

The spelling of 221559047 in words is "two hundred twenty-one million, five hundred fifty-nine thousand, forty-seven".