221372849 has 2 divisors, whose sum is σ = 221372850. Its totient is φ = 221372848.

The previous prime is 221372831. The next prime is 221372873. The reversal of 221372849 is 948273122.

221372849 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 184552225 + 36820624 = 13585^2 + 6068^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221372849 is a prime.

It is not a weakly prime, because it can be changed into another prime (221375849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110686424 + 110686425.

It is an arithmetic number, because the mean of its divisors is an integer number (110686425).

Almost surely, 2^221372849 is an apocalyptic number.

It is an amenable number.

221372849 is a deficient number, since it is larger than the sum of its proper divisors (1).

221372849 is an equidigital number, since it uses as much as digits as its factorization.

221372849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 38.

The square root of 221372849 is about 14878.6037315334. The cubic root of 221372849 is about 604.9341721971.

The spelling of 221372849 in words is "two hundred twenty-one million, three hundred seventy-two thousand, eight hundred forty-nine".