1211111222004 has 18 divisors (see below), whose sum is σ = 3061420033490. Its totient is φ = 403703740656.

The previous prime is 1211111221987. The next prime is 1211111222023. The reversal of 1211111222004 is 4002221111121.

It can be written as a sum of positive squares in only one way, i.e., 837609344100 + 373501877904 = 915210^2 + 611148^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 16820989159 + ... + 16820989230.

Almost surely, 2^{1211111222004} is an apocalyptic number.

It is an amenable number.

1211111222004 is an abundant number, since it is smaller than the sum of its proper divisors (1850308811486).

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

1211111222004 is a wasteful number, since it uses less digits than its factorization.

1211111222004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33641978399 (or 33641978394 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 1211111222004 its reverse (4002221111121), we get a palindrome (5213332333125).

The spelling of 1211111222004 in words is "one trillion, two hundred eleven billion, one hundred eleven million, two hundred twenty-two thousand, four".