1221100001204 has 12 divisors (see below), whose sum is σ = 2249394739200. Its totient is φ = 578415790008.

The previous prime is 1221100001203. The next prime is 1221100001267. The reversal of 1221100001204 is 4021000011221.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221100001203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8033552564 + ... + 8033552715.

It is an arithmetic number, because the mean of its divisors is an integer number (187449561600).

Almost surely, 2^{1221100001204} is an apocalyptic number.

It is an amenable number.

1221100001204 is a deficient number, since it is larger than the sum of its proper divisors (1028294737996).

1221100001204 is a wasteful number, since it uses less digits than its factorization.

1221100001204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16067105302 (or 16067105300 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 1221100001204 its reverse (4021000011221), we get a palindrome (5242100012425).

The spelling of 1221100001204 in words is "one trillion, two hundred twenty-one billion, one hundred million, one thousand, two hundred four".