221263493 has 8 divisors (see below), whose sum is σ = 254082720. Its totient is φ = 190561680.

The previous prime is 221263459. The next prime is 221263501. The reversal of 221263493 is 394362122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221263493 - 2¹⁸ = 221001349 is a prime.

It is a super-2 number, since 2×221263493² = 97915066669122098, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221263793) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 529130 + ... + 529547.

It is an arithmetic number, because the mean of its divisors is an integer number (31760340).

Almost surely, 2^221263493 is an apocalyptic number.

It is an amenable number.

221263493 is a deficient number, since it is larger than the sum of its proper divisors (32819227).

221263493 is a wasteful number, since it uses less digits than its factorization.

221263493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1058707.

The product of its digits is 15552, while the sum is 32.

The square root of 221263493 is about 14874.9283359618. The cubic root of 221263493 is about 604.8345452892.

The spelling of 221263493 in words is "two hundred twenty-one million, two hundred sixty-three thousand, four hundred ninety-three".