21312012119 has 2 divisors, whose sum is σ = 21312012120. Its totient is φ = 21312012118.

The previous prime is 21312012077. The next prime is 21312012151. The reversal of 21312012119 is 91121021312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21312012119 - 2²⁸ = 21043576663 is a prime.

It is a super-2 number, since 2×21312012119² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21312012094 and 21312012103.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21312042119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10656006059 + 10656006060.

It is an arithmetic number, because the mean of its divisors is an integer number (10656006060).

Almost surely, 2^21312012119 is an apocalyptic number.

21312012119 is a deficient number, since it is larger than the sum of its proper divisors (1).

21312012119 is an equidigital number, since it uses as much as digits as its factorization.

21312012119 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 23.

The spelling of 21312012119 in words is "twenty-one billion, three hundred twelve million, twelve thousand, one hundred nineteen".