71221143 has 16 divisors (see below), whose sum is σ = 114912000. Its totient is φ = 38303616.

The previous prime is 71221127. The next prime is 71221207. The reversal of 71221143 is 34112217.

It is not a de Polignac number, because 71221143 - 2⁴ = 71221127 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71221103) 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, 99393 + ... + 100106.

It is an arithmetic number, because the mean of its divisors is an integer number (7182000).

Almost surely, 2^71221143 is an apocalyptic number.

71221143 is a deficient number, since it is larger than the sum of its proper divisors (43690857).

71221143 is a wasteful number, since it uses less digits than its factorization.

71221143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199526.

The product of its digits is 336, while the sum is 21.

The square root of 71221143 is about 8439.2619938002. The cubic root of 71221143 is about 414.5112415060.

The spelling of 71221143 in words is "seventy-one million, two hundred twenty-one thousand, one hundred forty-three".