1221112210104 has 96 divisors (see below), whose sum is σ = 3437626832640. Its totient is φ = 406092722400.

The previous prime is 1221112210099. The next prime is 1221112210169. The reversal of 1221112210104 is 4010122111221.

It is a super-2 number, since 2×1221112210104² (a number of 25 digits) contains 22 as substring.

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 23 ways as a sum of consecutive naturals, for example, 109159 + ... + 1566569.

It is an arithmetic number, because the mean of its divisors is an integer number (35808612840).

Almost surely, 2^{1221112210104} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221112210104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1718813416320).

1221112210104 is an abundant number, since it is smaller than the sum of its proper divisors (2216514622536).

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

1221112210104 is a wasteful number, since it uses less digits than its factorization.

1221112210104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1457863 (or 1457847 counting only the distinct ones).

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

Adding to 1221112210104 its reverse (4010122111221), we get a palindrome (5231234321325).

The spelling of 1221112210104 in words is "one trillion, two hundred twenty-one billion, one hundred twelve million, two hundred ten thousand, one hundred four".