21867902843 has 2 divisors, whose sum is σ = 21867902844. Its totient is φ = 21867902842.

The previous prime is 21867902831. The next prime is 21867902891. The reversal of 21867902843 is 34820976812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21867902843 - 2⁶ = 21867902779 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21867902791 and 21867902800.

It is not a weakly prime, because it can be changed into another prime (21867904843) 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, 10933951421 + 10933951422.

It is an arithmetic number, because the mean of its divisors is an integer number (10933951422).

Almost surely, 2^21867902843 is an apocalyptic number.

21867902843 is a deficient number, since it is larger than the sum of its proper divisors (1).

21867902843 is an equidigital number, since it uses as much as digits as its factorization.

21867902843 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1161216, while the sum is 50.

The spelling of 21867902843 in words is "twenty-one billion, eight hundred sixty-seven million, nine hundred two thousand, eight hundred forty-three".