221422455 has 12 divisors (see below), whose sum is σ = 383799000. Its totient is φ = 118091952.

The previous prime is 221422423. The next prime is 221422459. The reversal of 221422455 is 554224122.

It is not a de Polignac number, because 221422455 - 2⁵ = 221422423 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221422459) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2460205 + ... + 2460294.

It is an arithmetic number, because the mean of its divisors is an integer number (31983250).

Almost surely, 2^221422455 is an apocalyptic number.

221422455 is a deficient number, since it is larger than the sum of its proper divisors (162376545).

221422455 is a wasteful number, since it uses less digits than its factorization.

221422455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4920510 (or 4920507 counting only the distinct ones).

The product of its digits is 6400, while the sum is 27.

The square root of 221422455 is about 14880.2706628609. The cubic root of 221422455 is about 604.9793540754.

Adding to 221422455 its reverse (554224122), we get a palindrome (775646577).

The spelling of 221422455 in words is "two hundred twenty-one million, four hundred twenty-two thousand, four hundred fifty-five".