221973047 has 4 divisors (see below), whose sum is σ = 229627320. Its totient is φ = 214318776.

The previous prime is 221973043. The next prime is 221973091. The reversal of 221973047 is 740379122.

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 221973047 - 2² = 221973043 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221972998 and 221973016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221973041) 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, 3827093 + ... + 3827150.

It is an arithmetic number, because the mean of its divisors is an integer number (57406830).

Almost surely, 2^221973047 is an apocalyptic number.

221973047 is a deficient number, since it is larger than the sum of its proper divisors (7654273).

221973047 is an equidigital number, since it uses as much as digits as its factorization.

221973047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7654272.

The product of its (nonzero) digits is 21168, while the sum is 35.

The square root of 221973047 is about 14898.7599148386. The cubic root of 221973047 is about 605.4803888944.

The spelling of 221973047 in words is "two hundred twenty-one million, nine hundred seventy-three thousand, forty-seven".