221332493 has 4 divisors (see below), whose sum is σ = 222088188. Its totient is φ = 220576800.

The previous prime is 221332453. The next prime is 221332499. The reversal of 221332493 is 394233122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 88322404 + 133010089 = 9398^2 + 11533^2 .

It is a cyclic number.

It is not a de Polignac number, because 221332493 - 2⁶ = 221332429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221332499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 377408 + ... + 377993.

It is an arithmetic number, because the mean of its divisors is an integer number (55522047).

Almost surely, 2^221332493 is an apocalyptic number.

It is an amenable number.

221332493 is a deficient number, since it is larger than the sum of its proper divisors (755695).

221332493 is an equidigital number, since it uses as much as digits as its factorization.

221332493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 755694.

The product of its digits is 7776, while the sum is 29.

The square root of 221332493 is about 14877.2474940763. The cubic root of 221332493 is about 604.8974103762.

The spelling of 221332493 in words is "two hundred twenty-one million, three hundred thirty-two thousand, four hundred ninety-three".