221481473 has 2 divisors, whose sum is σ = 221481474. Its totient is φ = 221481472.

The previous prime is 221481451. The next prime is 221481493. The reversal of 221481473 is 374184122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 201838849 + 19642624 = 14207^2 + 4432^2 .

It is a cyclic number.

It is not a de Polignac number, because 221481473 - 2¹⁰ = 221480449 is a prime.

It is not a weakly prime, because it can be changed into another prime (221481493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110740736 + 110740737.

It is an arithmetic number, because the mean of its divisors is an integer number (110740737).

Almost surely, 2^221481473 is an apocalyptic number.

It is an amenable number.

221481473 is a deficient number, since it is larger than the sum of its proper divisors (1).

221481473 is an equidigital number, since it uses as much as digits as its factorization.

221481473 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10752, while the sum is 32.

The square root of 221481473 is about 14882.2536263833. The cubic root of 221481473 is about 605.0330997532.

The spelling of 221481473 in words is "two hundred twenty-one million, four hundred eighty-one thousand, four hundred seventy-three".