1100210021221 has 2 divisors, whose sum is σ = 1100210021222. Its totient is φ = 1100210021220.

The previous prime is 1100210021213. The next prime is 1100210021233. The reversal of 1100210021221 is 1221200120011.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 790879390596 + 309330630625 = 889314^2 + 556175^2 .

It is a cyclic number.

It is not a de Polignac number, because 1100210021221 - 2³ = 1100210021213 is a prime.

It is a super-2 number, since 2×1100210021221² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1100210021021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 550105010610 + 550105010611.

It is an arithmetic number, because the mean of its divisors is an integer number (550105010611).

Almost surely, 2^{1100210021221} is an apocalyptic number.

It is an amenable number.

1100210021221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1100210021221 is an equidigital number, since it uses as much as digits as its factorization.

1100210021221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1100210021221 its reverse (1221200120011), we get a palindrome (2321410141232).

The spelling of 1100210021221 in words is "one trillion, one hundred billion, two hundred ten million, twenty-one thousand, two hundred twenty-one".