1211223220110 has 96 divisors (see below), whose sum is σ = 3181093051968. Its totient is φ = 319721241600.

The previous prime is 1211223220079. The next prime is 1211223220157. The reversal of 1211223220110 is 110223221121.

1211223220110 is a `hidden beast` number, since 1 + 211 + 22 + 322 + 0 + 110 = 666.

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 pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 47555239 + ... + 47580701.

It is an arithmetic number, because the mean of its divisors is an integer number (33136385958).

Almost surely, 2^{1211223220110} is an apocalyptic number.

1211223220110 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 1211223220110, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1590546525984).

1211223220110 is an abundant number, since it is smaller than the sum of its proper divisors (1969869831858).

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

1211223220110 is a wasteful number, since it uses less digits than its factorization.

1211223220110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30810 (or 30807 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 1211223220110 its reverse (110223221121), we get a palindrome (1321446441231).

The spelling of 1211223220110 in words is "one trillion, two hundred eleven billion, two hundred twenty-three million, two hundred twenty thousand, one hundred ten".