21016460833 has 2 divisors, whose sum is σ = 21016460834. Its totient is φ = 21016460832.

The previous prime is 21016460807. The next prime is 21016460873. The reversal of 21016460833 is 33806461012.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20742624529 + 273836304 = 144023^2 + 16548^2 .

It is a cyclic number.

It is not a de Polignac number, because 21016460833 - 2²¹ = 21014363681 is a prime.

It is not a weakly prime, because it can be changed into another prime (21016460873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10508230416 + 10508230417.

It is an arithmetic number, because the mean of its divisors is an integer number (10508230417).

Almost surely, 2^21016460833 is an apocalyptic number.

It is an amenable number.

21016460833 is a deficient number, since it is larger than the sum of its proper divisors (1).

21016460833 is an equidigital number, since it uses as much as digits as its factorization.

21016460833 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 34.

The spelling of 21016460833 in words is "twenty-one billion, sixteen million, four hundred sixty thousand, eight hundred thirty-three".