1221101222004 has 36 divisors (see below), whose sum is σ = 3110977053184. Its totient is φ = 403828749072.

The previous prime is 1221101221987. The next prime is 1221101222021. The reversal of 1221101222004 is 4002221011221.

It is an interprime number because it is at equal distance from previous prime (1221101221987) and next prime (1221101222021).

It is a tau number, because it is divible by the number of its divisors (36).

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 11 ways as a sum of consecutive naturals, for example, 133536682 + ... + 133545825.

Almost surely, 2^{1221101222004} is an apocalyptic number.

It is an amenable number.

1221101222004 is an abundant number, since it is smaller than the sum of its proper divisors (1889875831180).

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

1221101222004 is a wasteful number, since it uses less digits than its factorization.

1221101222004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267082644 (or 267082639 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 1221101222004 its reverse (4002221011221), we get a palindrome (5223322233225).

The spelling of 1221101222004 in words is "one trillion, two hundred twenty-one billion, one hundred one million, two hundred twenty-two thousand, four".