221246847 has 12 divisors (see below), whose sum is σ = 323625120. Its totient is φ = 145630368.

The previous prime is 221246843. The next prime is 221246869. The reversal of 221246847 is 748642122.

It is not a de Polignac number, because 221246847 - 2² = 221246843 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221246843) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 154878 + ... + 156299.

It is an arithmetic number, because the mean of its divisors is an integer number (26968760).

Almost surely, 2^221246847 is an apocalyptic number.

221246847 is a deficient number, since it is larger than the sum of its proper divisors (102378273).

221246847 is a wasteful number, since it uses less digits than its factorization.

221246847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311262 (or 311259 counting only the distinct ones).

The product of its digits is 43008, while the sum is 36.

The square root of 221246847 is about 14874.3687933304. The cubic root of 221246847 is about 604.8193773580.

Adding to 221246847 its reverse (748642122), we get a palindrome (969888969).

The spelling of 221246847 in words is "two hundred twenty-one million, two hundred forty-six thousand, eight hundred forty-seven".