11021231213 has 2 divisors, whose sum is σ = 11021231214. Its totient is φ = 11021231212.

The previous prime is 11021231209. The next prime is 11021231231. The reversal of 11021231213 is 31213212011.

Together with next prime (11021231231) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10281554404 + 739676809 = 101398^2 + 27197^2 .

It is a cyclic number.

It is not a de Polignac number, because 11021231213 - 2² = 11021231209 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11021231191 and 11021231200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11021231233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5510615606 + 5510615607.

It is an arithmetic number, because the mean of its divisors is an integer number (5510615607).

Almost surely, 2^11021231213 is an apocalyptic number.

It is an amenable number.

11021231213 is a deficient number, since it is larger than the sum of its proper divisors (1).

11021231213 is an equidigital number, since it uses as much as digits as its factorization.

11021231213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 11021231213 its reverse (31213212011), we get a palindrome (42234443224).

The spelling of 11021231213 in words is "eleven billion, twenty-one million, two hundred thirty-one thousand, two hundred thirteen".