21450542033 has 2 divisors, whose sum is σ = 21450542034. Its totient is φ = 21450542032.

The previous prime is 21450541961. The next prime is 21450542051. The reversal of 21450542033 is 33024505412.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19189729729 + 2260812304 = 138527^2 + 47548^2 .

It is a cyclic number.

It is not a de Polignac number, because 21450542033 - 2¹² = 21450537937 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21450541987 and 21450542005.

It is not a weakly prime, because it can be changed into another prime (21450542083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10725271016 + 10725271017.

It is an arithmetic number, because the mean of its divisors is an integer number (10725271017).

Almost surely, 2^21450542033 is an apocalyptic number.

It is an amenable number.

21450542033 is a deficient number, since it is larger than the sum of its proper divisors (1).

21450542033 is an equidigital number, since it uses as much as digits as its factorization.

21450542033 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14400, while the sum is 29.

The spelling of 21450542033 in words is "twenty-one billion, four hundred fifty million, five hundred forty-two thousand, thirty-three".