21660550332033 has 16 divisors (see below), whose sum is σ = 28925553476160. Its totient is φ = 14417957945664.

The previous prime is 21660550332013. The next prime is 21660550332037. The reversal of 21660550332033 is 33023305506612.

It is a happy number.

It is not a de Polignac number, because 21660550332033 - 2⁶ = 21660550331969 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21660550331982 and 21660550332000.

It is not an unprimeable number, because it can be changed into a prime (21660550332037) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 139773610 + ... + 139928492.

It is an arithmetic number, because the mean of its divisors is an integer number (1807847092260).

Almost surely, 2^{21660550332033} is an apocalyptic number.

It is an amenable number.

21660550332033 is a deficient number, since it is larger than the sum of its proper divisors (7265003144127).

21660550332033 is a wasteful number, since it uses less digits than its factorization.

21660550332033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226928.

The product of its (nonzero) digits is 291600, while the sum is 39.

Adding to 21660550332033 its reverse (33023305506612), we get a palindrome (54683855838645).

The spelling of 21660550332033 in words is "twenty-one trillion, six hundred sixty billion, five hundred fifty million, three hundred thirty-two thousand, thirty-three".