221142293 has 2 divisors, whose sum is σ = 221142294. Its totient is φ = 221142292.

The previous prime is 221142269. The next prime is 221142343. The reversal of 221142293 is 392241122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 174055249 + 47087044 = 13193^2 + 6862^2 .

It is a cyclic number.

It is not a de Polignac number, because 221142293 - 2²² = 216947989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221142253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110571146 + 110571147.

It is an arithmetic number, because the mean of its divisors is an integer number (110571147).

Almost surely, 2^221142293 is an apocalyptic number.

It is an amenable number.

221142293 is a deficient number, since it is larger than the sum of its proper divisors (1).

221142293 is an equidigital number, since it uses as much as digits as its factorization.

221142293 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 26.

The square root of 221142293 is about 14870.8538087092. The cubic root of 221142293 is about 604.7240897493.

The spelling of 221142293 in words is "two hundred twenty-one million, one hundred forty-two thousand, two hundred ninety-three".