221285493 has 64 divisors (see below), whose sum is σ = 395808000. Its totient is φ = 120372480.

The previous prime is 221285489. The next prime is 221285503. The reversal of 221285493 is 394582122.

It is a happy number.

It is not a de Polignac number, because 221285493 - 2² = 221285489 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221285423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 142083 + ... + 143631.

It is an arithmetic number, because the mean of its divisors is an integer number (6184500).

Almost surely, 2^221285493 is an apocalyptic number.

It is an amenable number.

221285493 is a deficient number, since it is larger than the sum of its proper divisors (174522507).

221285493 is a wasteful number, since it uses less digits than its factorization.

221285493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1619 (or 1613 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 221285493 is about 14875.6678169419. The cubic root of 221285493 is about 604.8545906490.

The spelling of 221285493 in words is "two hundred twenty-one million, two hundred eighty-five thousand, four hundred ninety-three".