21312302021443 has 2 divisors, whose sum is σ = 21312302021444. Its totient is φ = 21312302021442.

The previous prime is 21312302021419. The next prime is 21312302021449. The reversal of 21312302021443 is 34412020321312.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21312302021443 is a prime.

It is not a weakly prime, because it can be changed into another prime (21312302021449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10656151010721 + 10656151010722.

It is an arithmetic number, because the mean of its divisors is an integer number (10656151010722).

Almost surely, 2^{21312302021443} is an apocalyptic number.

21312302021443 is a deficient number, since it is larger than the sum of its proper divisors (1).

21312302021443 is an equidigital number, since it uses as much as digits as its factorization.

21312302021443 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 28.

Adding to 21312302021443 its reverse (34412020321312), we get a palindrome (55724322342755).

The spelling of 21312302021443 in words is "twenty-one trillion, three hundred twelve billion, three hundred two million, twenty-one thousand, four hundred forty-three".