71400221 has 4 divisors (see below), whose sum is σ = 75600252. Its totient is φ = 67200192.

The previous prime is 71400179. The next prime is 71400239. The reversal of 71400221 is 12200417.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 30580900 + 40819321 = 5530^2 + 6389^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71400221 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 4200013 = 71400221 / (7 + 1 + 4 + 0 + 0 + 2 + 2 + 1).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 71400221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71400281) 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 3 ways as a sum of consecutive naturals, for example, 2099990 + ... + 2100023.

It is an arithmetic number, because the mean of its divisors is an integer number (18900063).

Almost surely, 2^71400221 is an apocalyptic number.

It is an amenable number.

71400221 is a deficient number, since it is larger than the sum of its proper divisors (4200031).

71400221 is a wasteful number, since it uses less digits than its factorization.

71400221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4200030.

The product of its (nonzero) digits is 112, while the sum is 17.

The square root of 71400221 is about 8449.8651468529. The cubic root of 71400221 is about 414.8583655639.

Adding to 71400221 its reverse (12200417), we get a palindrome (83600638).

The spelling of 71400221 in words is "seventy-one million, four hundred thousand, two hundred twenty-one".