11013021221 has 2 divisors, whose sum is σ = 11013021222. Its totient is φ = 11013021220.

The previous prime is 11013021211. The next prime is 11013021233. The reversal of 11013021221 is 12212031011.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9872608321 + 1140412900 = 99361^2 + 33770^2 .

It is a cyclic number.

It is not a de Polignac number, because 11013021221 - 2³⁰ = 9939279397 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11013021196 and 11013021205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11013021211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5506510610 + 5506510611.

It is an arithmetic number, because the mean of its divisors is an integer number (5506510611).

Almost surely, 2^11013021221 is an apocalyptic number.

It is an amenable number.

11013021221 is a deficient number, since it is larger than the sum of its proper divisors (1).

11013021221 is an equidigital number, since it uses as much as digits as its factorization.

11013021221 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 14.

Adding to 11013021221 its reverse (12212031011), we get a palindrome (23225052232).

The spelling of 11013021221 in words is "eleven billion, thirteen million, twenty-one thousand, two hundred twenty-one".