21206130634233 has 12 divisors (see below), whose sum is σ = 30727705591908. Its totient is φ = 14092822880160.

The previous prime is 21206130634201. The next prime is 21206130634253. The reversal of 21206130634233 is 33243603160212.

21206130634233 is a `hidden beast` number, since 2 + 1 + 2 + 0 + 6 + 1 + 306 + 342 + 3 + 3 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1205808236649 + 20000322397584 = 1098093^2 + 4472172^2 .

It is not a de Polignac number, because 21206130634233 - 2⁵ = 21206130634201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21206130634253) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3716458878 + ... + 3716464583.

It is an arithmetic number, because the mean of its divisors is an integer number (2560642132659).

Almost surely, 2^{21206130634233} is an apocalyptic number.

It is an amenable number.

21206130634233 is a deficient number, since it is larger than the sum of its proper divisors (9521574957675).

21206130634233 is a wasteful number, since it uses less digits than its factorization.

21206130634233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7432923784 (or 7432923781 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 36.

Adding to 21206130634233 its reverse (33243603160212), we get a palindrome (54449733794445).

The spelling of 21206130634233 in words is "twenty-one trillion, two hundred six billion, one hundred thirty million, six hundred thirty-four thousand, two hundred thirty-three".