1221911390104 has 16 divisors (see below), whose sum is σ = 2328642609120. Its totient is φ = 600940027680.

The previous prime is 1221911390041. The next prime is 1221911390111. The reversal of 1221911390104 is 4010931191221.

It is a self number, because there is not a number n which added to its sum of digits gives 1221911390104.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1251957904 + ... + 1251958879.

It is an arithmetic number, because the mean of its divisors is an integer number (145540163070).

Almost surely, 2^{1221911390104} is an apocalyptic number.

It is an amenable number.

1221911390104 is a deficient number, since it is larger than the sum of its proper divisors (1106731219016).

1221911390104 is a wasteful number, since it uses less digits than its factorization.

1221911390104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2503916850 (or 2503916846 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 34.

The spelling of 1221911390104 in words is "one trillion, two hundred twenty-one billion, nine hundred eleven million, three hundred ninety thousand, one hundred four".