1221012231204 has 24 divisors (see below), whose sum is σ = 2888056329760. Its totient is φ = 401428678464.

The previous prime is 1221012231191. The next prime is 1221012231209. The reversal of 1221012231204 is 4021322101221.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1221012231209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 696923914 + ... + 696925665.

Almost surely, 2^{1221012231204} is an apocalyptic number.

It is an amenable number.

1221012231204 is an abundant number, since it is smaller than the sum of its proper divisors (1667044098556).

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

1221012231204 is a wasteful number, since it uses less digits than its factorization.

1221012231204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1393849659 (or 1393849657 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 1221012231204 its reverse (4021322101221), we get a palindrome (5242334332425).

The spelling of 1221012231204 in words is "one trillion, two hundred twenty-one billion, twelve million, two hundred thirty-one thousand, two hundred four".