71221140 has 48 divisors (see below), whose sum is σ = 221578560. Its totient is φ = 18992160.

The previous prime is 71221127. The next prime is 71221207. The reversal of 71221140 is 4112217.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65406 + ... + 66485.

It is an arithmetic number, because the mean of its divisors is an integer number (4616220).

Almost surely, 2^71221140 is an apocalyptic number.

It is an amenable number.

71221140 is an abundant number, since it is smaller than the sum of its proper divisors (150357420).

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

71221140 is a wasteful number, since it uses less digits than its factorization.

71221140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131909 (or 131901 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 18.

The square root of 71221140 is about 8439.2618160595. The cubic root of 71221140 is about 414.5112356859.

Adding to 71221140 its reverse (4112217), we get a palindrome (75333357).

The spelling of 71221140 in words is "seventy-one million, two hundred twenty-one thousand, one hundred forty".