84023840921 has 2 divisors, whose sum is σ = 84023840922. Its totient is φ = 84023840920.

The previous prime is 84023840863. The next prime is 84023841059. The reversal of 84023840921 is 12904832048.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60064206400 + 23959634521 = 245080^2 + 154789^2 .

It is a cyclic number.

It is not a de Polignac number, because 84023840921 - 2¹⁴ = 84023824537 is a prime.

It is not a weakly prime, because it can be changed into another prime (84023840321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42011920460 + 42011920461.

It is an arithmetic number, because the mean of its divisors is an integer number (42011920461).

Almost surely, 2^84023840921 is an apocalyptic number.

It is an amenable number.

84023840921 is a deficient number, since it is larger than the sum of its proper divisors (1).

84023840921 is an equidigital number, since it uses as much as digits as its factorization.

84023840921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 110592, while the sum is 41.

The spelling of 84023840921 in words is "eighty-four billion, twenty-three million, eight hundred forty thousand, nine hundred twenty-one".