1100123221 has 2 divisors, whose sum is σ = 1100123222. Its totient is φ = 1100123220.

The previous prime is 1100123191. The next prime is 1100123239. The reversal of 1100123221 is 1223210011.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 772006225 + 328116996 = 27785^2 + 18114^2 .

It is a cyclic number.

It is not a de Polignac number, because 1100123221 - 2²⁹ = 563252309 is a prime.

It is a super-2 number, since 2×1100123221² = 2420542202766829682, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1100163221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 550061610 + 550061611.

It is an arithmetic number, because the mean of its divisors is an integer number (550061611).

Almost surely, 2^1100123221 is an apocalyptic number.

It is an amenable number.

1100123221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1100123221 is an equidigital number, since it uses as much as digits as its factorization.

1100123221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1100123221 is about 33168.1054780040. The cubic root of 1100123221 is about 1032.3186590439.

Adding to 1100123221 its reverse (1223210011), we get a palindrome (2323333232).

The spelling of 1100123221 in words is "one billion, one hundred million, one hundred twenty-three thousand, two hundred twenty-one".