11213223121 has 2 divisors, whose sum is σ = 11213223122. Its totient is φ = 11213223120.

The previous prime is 11213223101. The next prime is 11213223167. The reversal of 11213223121 is 12132231211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6364050625 + 4849172496 = 79775^2 + 69636^2 .

It is a cyclic number.

It is not a de Polignac number, because 11213223121 - 2⁵ = 11213223089 is a prime.

It is a super-2 number, since 2×11213223121² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11213223101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5606611560 + 5606611561.

It is an arithmetic number, because the mean of its divisors is an integer number (5606611561).

Almost surely, 2^11213223121 is an apocalyptic number.

It is an amenable number.

11213223121 is a deficient number, since it is larger than the sum of its proper divisors (1).

11213223121 is an equidigital number, since it uses as much as digits as its factorization.

11213223121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 144, while the sum is 19.

Adding to 11213223121 its reverse (12132231211), we get a palindrome (23345454332).

The spelling of 11213223121 in words is "eleven billion, two hundred thirteen million, two hundred twenty-three thousand, one hundred twenty-one".