21630013090843 has 2 divisors, whose sum is σ = 21630013090844. Its totient is φ = 21630013090842.

The previous prime is 21630013090823. The next prime is 21630013090891. The reversal of 21630013090843 is 34809031003612.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21630013090843 - 2⁹ = 21630013090331 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21630013090796 and 21630013090805.

It is not a weakly prime, because it can be changed into another prime (21630013090823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10815006545421 + 10815006545422.

It is an arithmetic number, because the mean of its divisors is an integer number (10815006545422).

Almost surely, 2^{21630013090843} is an apocalyptic number.

21630013090843 is a deficient number, since it is larger than the sum of its proper divisors (1).

21630013090843 is an equidigital number, since it uses as much as digits as its factorization.

21630013090843 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 40.

The spelling of 21630013090843 in words is "twenty-one trillion, six hundred thirty billion, thirteen million, ninety thousand, eight hundred forty-three".