221952293 has 2 divisors, whose sum is σ = 221952294. Its totient is φ = 221952292.

The previous prime is 221952259. The next prime is 221952329. The reversal of 221952293 is 392259122.

Together with next prime (221952329) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 221920609 + 31684 = 14897^2 + 178^2 .

It is a cyclic number.

It is not a de Polignac number, because 221952293 - 2¹² = 221948197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221952893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110976146 + 110976147.

It is an arithmetic number, because the mean of its divisors is an integer number (110976147).

Almost surely, 2^221952293 is an apocalyptic number.

It is an amenable number.

221952293 is a deficient number, since it is larger than the sum of its proper divisors (1).

221952293 is an equidigital number, since it uses as much as digits as its factorization.

221952293 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19440, while the sum is 35.

The square root of 221952293 is about 14898.0633976366. The cubic root of 221952293 is about 605.4615179372.

The spelling of 221952293 in words is "two hundred twenty-one million, nine hundred fifty-two thousand, two hundred ninety-three".