221298093 has 6 divisors (see below), whose sum is σ = 319652814. Its totient is φ = 147532056.

The previous prime is 221298083. The next prime is 221298107. The reversal of 221298093 is 390892122.

It can be written as a sum of positive squares in only one way, i.e., 216619524 + 4678569 = 14718^2 + 2163^2 .

It is not a de Polignac number, because 221298093 - 2⁶ = 221298029 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221298053) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12294330 + ... + 12294347.

It is an arithmetic number, because the mean of its divisors is an integer number (53275469).

Almost surely, 2^221298093 is an apocalyptic number.

It is an amenable number.

221298093 is a deficient number, since it is larger than the sum of its proper divisors (98354721).

221298093 is a wasteful number, since it uses less digits than its factorization.

221298093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24588683 (or 24588680 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 221298093 is about 14876.0913213115. The cubic root of 221298093 is about 604.8660705749.

The spelling of 221298093 in words is "two hundred twenty-one million, two hundred ninety-eight thousand, ninety-three".