71221380 has 24 divisors (see below), whose sum is σ = 199420032. Its totient is φ = 18992352.

The previous prime is 71221379. The next prime is 71221399. The reversal of 71221380 is 8312217.

It is a self number, because there is not a number n which added to its sum of digits gives 71221380.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 593452 + ... + 593571.

It is an arithmetic number, because the mean of its divisors is an integer number (8309168).

Almost surely, 2^71221380 is an apocalyptic number.

It is an amenable number.

71221380 is an abundant number, since it is smaller than the sum of its proper divisors (128198652).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71221380 is a wasteful number, since it uses less digits than its factorization.

71221380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1187035 (or 1187033 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 71221380 is about 8439.2760353007. The cubic root of 71221380 is about 414.5117012901.

Adding to 71221380 its reverse (8312217), we get a palindrome (79533597).

The spelling of 71221380 in words is "seventy-one million, two hundred twenty-one thousand, three hundred eighty".