1211221444004 has 96 divisors (see below), whose sum is σ = 2572232097792. Its totient is φ = 491485968000.

The previous prime is 1211221443983. The next prime is 1211221444009. The reversal of 1211221444004 is 4004441221121.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is not an unprimeable number, because it can be changed into a prime (1211221444009) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27764249 + ... + 27807839.

It is an arithmetic number, because the mean of its divisors is an integer number (26794084352).

Almost surely, 2^{1211221444004} is an apocalyptic number.

It is an amenable number.

1211221444004 is an abundant number, since it is smaller than the sum of its proper divisors (1361010653788).

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

1211221444004 is a wasteful number, since it uses less digits than its factorization.

1211221444004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45217 (or 45215 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 26.

Adding to 1211221444004 its reverse (4004441221121), we get a palindrome (5215662665125).

The spelling of 1211221444004 in words is "one trillion, two hundred eleven billion, two hundred twenty-one million, four hundred forty-four thousand, four".