71220012 has 24 divisors (see below), whose sum is σ = 166779312. Its totient is φ = 23654400.

The previous prime is 71220007. The next prime is 71220013. The reversal of 71220012 is 21002217.

It is a junction number, because it is equal to n+sod(n) for n = 71219973 and 71220000.

It is not an unprimeable number, because it can be changed into a prime (71220013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7189 + ... + 13932.

It is an arithmetic number, because the mean of its divisors is an integer number (6949138).

Almost surely, 2^71220012 is an apocalyptic number.

It is an amenable number.

71220012 is an abundant number, since it is smaller than the sum of its proper divisors (95559300).

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

71220012 is a wasteful number, since it uses less digits than its factorization.

71220012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21409 (or 21407 counting only the distinct ones).

The product of its (nonzero) digits is 56, while the sum is 15.

The square root of 71220012 is about 8439.1949853052. The cubic root of 71220012 is about 414.5090473322.

Adding to 71220012 its reverse (21002217), we get a palindrome (92222229).

The spelling of 71220012 in words is "seventy-one million, two hundred twenty thousand, twelve".