1211105223 has 16 divisors (see below), whose sum is σ = 1800626400. Its totient is φ = 804525120.

The previous prime is 1211105141. The next prime is 1211105243. The reversal of 1211105223 is 3225011121.

It is not a de Polignac number, because 1211105223 - 2¹⁴ = 1211088839 is a prime.

It is a super-2 number, since 2×1211105223² = 2933551722355759458, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1211105196 and 1211105205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211105243) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72228 + ... + 87401.

It is an arithmetic number, because the mean of its divisors is an integer number (112539150).

Almost surely, 2^1211105223 is an apocalyptic number.

1211105223 is a deficient number, since it is larger than the sum of its proper divisors (589521177).

1211105223 is a wasteful number, since it uses less digits than its factorization.

1211105223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159919 (or 159913 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 1211105223 is about 34800.9370994518. The cubic root of 1211105223 is about 1065.9265810368.

Adding to 1211105223 its reverse (3225011121), we get a palindrome (4436116344).

The spelling of 1211105223 in words is "one billion, two hundred eleven million, one hundred five thousand, two hundred twenty-three".