221422473 has 6 divisors (see below), whose sum is σ = 319832474. Its totient is φ = 147614976.

The previous prime is 221422469. The next prime is 221422489. The reversal of 221422473 is 374224122.

It can be written as a sum of positive squares in only one way, i.e., 221325129 + 97344 = 14877^2 + 312^2 .

It is not a de Polignac number, because 221422473 - 2² = 221422469 is a prime.

It is a super-4 number, since 4×221422473⁴ (a number of 34 digits) contains 4444 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221422423) 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 5 ways as a sum of consecutive naturals, for example, 12301240 + ... + 12301257.

Almost surely, 2^221422473 is an apocalyptic number.

It is an amenable number.

221422473 is a deficient number, since it is larger than the sum of its proper divisors (98410001).

221422473 is a wasteful number, since it uses less digits than its factorization.

221422473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24602503 (or 24602500 counting only the distinct ones).

The product of its digits is 5376, while the sum is 27.

The square root of 221422473 is about 14880.2712676886. The cubic root of 221422473 is about 604.9793704689.

Adding to 221422473 its reverse (374224122), we get a palindrome (595646595).

The spelling of 221422473 in words is "two hundred twenty-one million, four hundred twenty-two thousand, four hundred seventy-three".