21222011001943 has 2 divisors, whose sum is σ = 21222011001944. Its totient is φ = 21222011001942.

The previous prime is 21222011001941. The next prime is 21222011002021. The reversal of 21222011001943 is 34910011022212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21222011001943 - 2¹ = 21222011001941 is a prime.

Together with 21222011001941, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21222011001941) 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, 10611005500971 + 10611005500972.

It is an arithmetic number, because the mean of its divisors is an integer number (10611005500972).

Almost surely, 2^{21222011001943} is an apocalyptic number.

21222011001943 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222011001943 is an equidigital number, since it uses as much as digits as its factorization.

21222011001943 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 28.

The spelling of 21222011001943 in words is "twenty-one trillion, two hundred twenty-two billion, eleven million, one thousand, nine hundred forty-three".