1221223012 has 6 divisors (see below), whose sum is σ = 2137140278. Its totient is φ = 610611504.

The previous prime is 1221222997. The next prime is 1221223013. The reversal of 1221223012 is 2103221221.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1221083136 + 139876 = 34944^2 + 374^2 .

It is not an unprimeable number, because it can be changed into a prime (1221223013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152652873 + ... + 152652880.

Almost surely, 2^1221223012 is an apocalyptic number.

It is an amenable number.

1221223012 is a deficient number, since it is larger than the sum of its proper divisors (915917266).

1221223012 is a wasteful number, since it uses less digits than its factorization.

1221223012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305305757 (or 305305755 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 1221223012 is about 34946.0013735477. The cubic root of 1221223012 is about 1068.8866668269.

Subtracting from 1221223012 its product of nonzero digits (96), we obtain a square (1221222916 = 34946²).

Adding to 1221223012 its reverse (2103221221), we get a palindrome (3324444233).

The spelling of 1221223012 in words is "one billion, two hundred twenty-one million, two hundred twenty-three thousand, twelve".