1221100012110 has 384 divisors, whose sum is σ = 3531438549504. Its totient is φ = 267664849920.

The previous prime is 1221100012103. The next prime is 1221100012127. The reversal of 1221100012110 is 112100011221.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 233611317 + ... + 233616543.

It is an arithmetic number, because the mean of its divisors is an integer number (9196454556).

Almost surely, 2^{1221100012110} is an apocalyptic number.

1221100012110 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221100012110, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1765719274752).

1221100012110 is an abundant number, since it is smaller than the sum of its proper divisors (2310338537394).

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

1221100012110 is a wasteful number, since it uses less digits than its factorization.

1221100012110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5376 (or 5357 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 1221100012110 its reverse (112100011221), we get a palindrome (1333200023331).

The spelling of 1221100012110 in words is "one trillion, two hundred twenty-one billion, one hundred million, twelve thousand, one hundred ten".