21603070033 has 2 divisors, whose sum is σ = 21603070034. Its totient is φ = 21603070032.

The previous prime is 21603070019. The next prime is 21603070051. The reversal of 21603070033 is 33007030612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15743473729 + 5859596304 = 125473^2 + 76548^2 .

It is a cyclic number.

It is not a de Polignac number, because 21603070033 - 2²⁵ = 21569515601 is a prime.

It is not a weakly prime, because it can be changed into another prime (21603070133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10801535016 + 10801535017.

It is an arithmetic number, because the mean of its divisors is an integer number (10801535017).

Almost surely, 2^21603070033 is an apocalyptic number.

It is an amenable number.

21603070033 is a deficient number, since it is larger than the sum of its proper divisors (1).

21603070033 is an equidigital number, since it uses as much as digits as its factorization.

21603070033 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2268, while the sum is 25.

The spelling of 21603070033 in words is "twenty-one billion, six hundred three million, seventy thousand, thirty-three".