221394846247 has 4 divisors (see below), whose sum is σ = 229029151320. Its totient is φ = 213760541176.

The previous prime is 221394846191. The next prime is 221394846269. The reversal of 221394846247 is 742648493122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 742648493122 = 2 ⋅371324246561.

It is not a de Polignac number, because 221394846247 - 2²³ = 221386457639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221394846194 and 221394846203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221394846287) 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, 3817152493 + ... + 3817152550.

It is an arithmetic number, because the mean of its divisors is an integer number (57257287830).

Almost surely, 2^221394846247 is an apocalyptic number.

221394846247 is a deficient number, since it is larger than the sum of its proper divisors (7634305073).

221394846247 is an equidigital number, since it uses as much as digits as its factorization.

221394846247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7634305072.

The product of its digits is 4644864, while the sum is 52.

The spelling of 221394846247 in words is "two hundred twenty-one billion, three hundred ninety-four million, eight hundred forty-six thousand, two hundred forty-seven".