21534011233 has 12 divisors (see below), whose sum is σ = 25077438192. Its totient is φ = 18437335560.

The previous prime is 21534011227. The next prime is 21534011269. The reversal of 21534011233 is 33211043512.

It is a happy number.

It is not a de Polignac number, because 21534011233 - 2⁵ = 21534011201 is a prime.

It is a super-3 number, since 3×21534011233³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21534011198 and 21534011207.

It is not an unprimeable number, because it can be changed into a prime (21534011293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 197823 + ... + 286708.

It is an arithmetic number, because the mean of its divisors is an integer number (2089786516).

Almost surely, 2^21534011233 is an apocalyptic number.

It is an amenable number.

21534011233 is a deficient number, since it is larger than the sum of its proper divisors (3543426959).

21534011233 is an equidigital number, since it uses as much as digits as its factorization.

21534011233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 485452 (or 485445 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

Adding to 21534011233 its reverse (33211043512), we get a palindrome (54745054745).

The spelling of 21534011233 in words is "twenty-one billion, five hundred thirty-four million, eleven thousand, two hundred thirty-three".