1221220012 has 24 divisors (see below), whose sum is σ = 2149056000. Its totient is φ = 607214976.

The previous prime is 1221220001. The next prime is 1221220027. The reversal of 1221220012 is 2100221221.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1221219974 and 1221220001.

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, 625614 + ... + 627562.

It is an arithmetic number, because the mean of its divisors is an integer number (89544000).

Almost surely, 2^1221220012 is an apocalyptic number.

It is an amenable number.

1221220012 is a deficient number, since it is larger than the sum of its proper divisors (927835988).

1221220012 is a wasteful number, since it uses less digits than its factorization.

1221220012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2745 (or 2743 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 1221220012 is about 34945.9584501556. The cubic root of 1221220012 is about 1068.8857915670.

Adding to 1221220012 its reverse (2100221221), we get a palindrome (3321441233).

The spelling of 1221220012 in words is "one billion, two hundred twenty-one million, two hundred twenty thousand, twelve".