11231221012309 has 2 divisors, whose sum is σ = 11231221012310. Its totient is φ = 11231221012308.

The previous prime is 11231221012303. The next prime is 11231221012421. The reversal of 11231221012309 is 90321012213211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6202764586225 + 5028456426084 = 2490535^2 + 2242422^2 .

It is a cyclic number.

It is not a de Polignac number, because 11231221012309 - 2³ = 11231221012301 is a prime.

It is a super-2 number, since 2×11231221012309² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11231221012301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5615610506154 + 5615610506155.

It is an arithmetic number, because the mean of its divisors is an integer number (5615610506155).

Almost surely, 2^{11231221012309} is an apocalyptic number.

It is an amenable number.

11231221012309 is a deficient number, since it is larger than the sum of its proper divisors (1).

11231221012309 is an equidigital number, since it uses as much as digits as its factorization.

11231221012309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 28.

The spelling of 11231221012309 in words is "eleven trillion, two hundred thirty-one billion, two hundred twenty-one million, twelve thousand, three hundred nine".