13221221012 has 24 divisors (see below), whose sum is σ = 23442706560. Its totient is φ = 6523395840.

The previous prime is 13221220979. The next prime is 13221221071. The reversal of 13221221012 is 21012212231.

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, 630212 + ... + 650852.

It is an arithmetic number, because the mean of its divisors is an integer number (976779440).

Almost surely, 2^13221221012 is an apocalyptic number.

It is an amenable number.

13221221012 is a deficient number, since it is larger than the sum of its proper divisors (10221485548).

13221221012 is a wasteful number, since it uses less digits than its factorization.

13221221012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22751 (or 22749 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 13221221012 its reverse (21012212231), we get a palindrome (34233433243).

The spelling of 13221221012 in words is "thirteen billion, two hundred twenty-one million, two hundred twenty-one thousand, twelve".