71221839 has 12 divisors (see below), whose sum is σ = 102829896. Its totient is φ = 43828512.

The previous prime is 71221837. The next prime is 71221841. The reversal of 71221839 is 93812217.

It is an interprime number because it is at equal distance from previous prime (71221837) and next prime (71221841).

It is not a de Polignac number, because 71221839 - 2¹ = 71221837 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71221837) 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, 69732 + ... + 70745.

It is an arithmetic number, because the mean of its divisors is an integer number (8569158).

Almost surely, 2^71221839 is an apocalyptic number.

71221839 is a deficient number, since it is larger than the sum of its proper divisors (31608057).

71221839 is a wasteful number, since it uses less digits than its factorization.

71221839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140506 (or 140493 counting only the distinct ones).

The product of its digits is 6048, while the sum is 33.

The square root of 71221839 is about 8439.3032295326. The cubic root of 71221839 is about 414.5125917552.

The spelling of 71221839 in words is "seventy-one million, two hundred twenty-one thousand, eight hundred thirty-nine".