21123321311219 has 2 divisors, whose sum is σ = 21123321311220. Its totient is φ = 21123321311218.

The previous prime is 21123321311203. The next prime is 21123321311249. The reversal of 21123321311219 is 91211312332112.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21123321311219 - 2⁴ = 21123321311203 is a prime.

It is a super-2 number, since 2×21123321311219² (a number of 27 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (21123321311249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10561660655609 + 10561660655610.

It is an arithmetic number, because the mean of its divisors is an integer number (10561660655610).

Almost surely, 2^{21123321311219} is an apocalyptic number.

21123321311219 is a deficient number, since it is larger than the sum of its proper divisors (1).

21123321311219 is an equidigital number, since it uses as much as digits as its factorization.

21123321311219 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3888, while the sum is 32.

The spelling of 21123321311219 in words is "twenty-one trillion, one hundred twenty-three billion, three hundred twenty-one million, three hundred eleven thousand, two hundred nineteen".