1211321000023 has 2 divisors, whose sum is σ = 1211321000024. Its totient is φ = 1211321000022.

The previous prime is 1211320999991. The next prime is 1211321000027. The reversal of 1211321000023 is 3200001231121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1211321000023 - 2⁵ = 1211320999991 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1211320999970 and 1211321000006.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211321000027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605660500011 + 605660500012.

It is an arithmetic number, because the mean of its divisors is an integer number (605660500012).

Almost surely, 2^{1211321000023} is an apocalyptic number.

1211321000023 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211321000023 is an equidigital number, since it uses as much as digits as its factorization.

1211321000023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 1211321000023 its reverse (3200001231121), we get a palindrome (4411322231144).

The spelling of 1211321000023 in words is "one trillion, two hundred eleven billion, three hundred twenty-one million, twenty-three", and thus it is an aban number.