221622457 has 16 divisors (see below), whose sum is σ = 265715712. Its totient is φ = 180726480.

The previous prime is 221622433. The next prime is 221622463. The reversal of 221622457 is 754226122.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221622457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221622407) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27148 + ... + 34354.

It is an arithmetic number, because the mean of its divisors is an integer number (16607232).

Almost surely, 2^221622457 is an apocalyptic number.

It is an amenable number.

221622457 is a deficient number, since it is larger than the sum of its proper divisors (44093255).

221622457 is a wasteful number, since it uses less digits than its factorization.

221622457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7428.

The product of its digits is 13440, while the sum is 31.

The square root of 221622457 is about 14886.9895210550. The cubic root of 221622457 is about 605.1614504342.

Adding to 221622457 its reverse (754226122), we get a palindrome (975848579).

The spelling of 221622457 in words is "two hundred twenty-one million, six hundred twenty-two thousand, four hundred fifty-seven".