21213545110233 has 16 divisors (see below), whose sum is σ = 33730854337536. Its totient is φ = 11594981178000.

The previous prime is 21213545110217. The next prime is 21213545110253. The reversal of 21213545110233 is 33201154531212.

It is a happy number.

It is not a de Polignac number, because 21213545110233 - 2⁴ = 21213545110217 is a prime.

It is a super-2 number, since 2×21213545110233² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21213545110194 and 21213545110203.

It is not an unprimeable number, because it can be changed into a prime (21213545110253) 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, 21960191143 + ... + 21960192108.

It is an arithmetic number, because the mean of its divisors is an integer number (2108178396096).

Almost surely, 2^{21213545110233} is an apocalyptic number.

21213545110233 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21213545110233 is a deficient number, since it is larger than the sum of its proper divisors (12517309227303).

21213545110233 is a wasteful number, since it uses less digits than its factorization.

21213545110233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43920383284.

The product of its (nonzero) digits is 21600, while the sum is 33.

Adding to 21213545110233 its reverse (33201154531212), we get a palindrome (54414699641445).

The spelling of 21213545110233 in words is "twenty-one trillion, two hundred thirteen billion, five hundred forty-five million, one hundred ten thousand, two hundred thirty-three".