11001222002221 has 48 divisors (see below), whose sum is σ = 13174310835504. Its totient is φ = 9143763200000.

The previous prime is 11001222002191. The next prime is 11001222002279. The reversal of 11001222002221 is 12220022210011.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 2006387260900 + 8994834741321 = 1416470^2 + 2999139^2 .

It is not a de Polignac number, because 11001222002221 - 2¹³ = 11001221994029 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11001222002195 and 11001222002204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11001222062221) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10511571 + ... + 11510671.

It is an arithmetic number, because the mean of its divisors is an integer number (274464809073).

Almost surely, 2^{11001222002221} is an apocalyptic number.

11001222002221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11001222002221 is a deficient number, since it is larger than the sum of its proper divisors (2173088833283).

11001222002221 is a wasteful number, since it uses less digits than its factorization.

11001222002221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 999294 (or 999283 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 11001222002221 its reverse (12220022210011), we get a palindrome (23221244212232).

The spelling of 11001222002221 in words is "eleven trillion, one billion, two hundred twenty-two million, two thousand, two hundred twenty-one".