21002322043 has 2 divisors, whose sum is σ = 21002322044. Its totient is φ = 21002322042.

The previous prime is 21002321941. The next prime is 21002322067. The reversal of 21002322043 is 34022320012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21002322043 - 2⁹ = 21002321531 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21002322043.

It is not a weakly prime, because it can be changed into another prime (21002322643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10501161021 + 10501161022.

It is an arithmetic number, because the mean of its divisors is an integer number (10501161022).

Almost surely, 2^21002322043 is an apocalyptic number.

21002322043 is a deficient number, since it is larger than the sum of its proper divisors (1).

21002322043 is an equidigital number, since it uses as much as digits as its factorization.

21002322043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 19.

Adding to 21002322043 its reverse (34022320012), we get a palindrome (55024642055).

It can be divided in two parts, 2100232 and 2043, that added together give a triangular number (2102275 = T₂₀₅₀).

The spelling of 21002322043 in words is "twenty-one billion, two million, three hundred twenty-two thousand, forty-three".