71221240 has 32 divisors (see below), whose sum is σ = 160516080. Its totient is φ = 28440832.

The previous prime is 71221217. The next prime is 71221259. The reversal of 71221240 is 4212217.

It is a happy number.

It is a congruent number.

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, 32004 + ... + 34156.

Almost surely, 2^71221240 is an apocalyptic number.

It is an amenable number.

71221240 is an abundant number, since it is smaller than the sum of its proper divisors (89294840).

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

71221240 is a wasteful number, since it uses less digits than its factorization.

71221240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2991 (or 2987 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 19.

The square root of 71221240 is about 8439.2677407462. The cubic root of 71221240 is about 414.5114296878.

Adding to 71221240 its reverse (4212217), we get a palindrome (75433457).

It can be divided in two parts, 712 and 21240, that added together give a cube (21952 = 28³).

The spelling of 71221240 in words is "seventy-one million, two hundred twenty-one thousand, two hundred forty".