21211232033 has 4 divisors (see below), whose sum is σ = 21214286148. Its totient is φ = 21208177920.

The previous prime is 21211231967. The next prime is 21211232069. The reversal of 21211232033 is 33023211212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8425954849 + 12785277184 = 91793^2 + 113072^2 .

It is a cyclic number.

It is not a de Polignac number, because 21211232033 - 2¹⁶ = 21211166497 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21211231996 and 21211232014.

It is not an unprimeable number, because it can be changed into a prime (21211292033) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1516616 + ... + 1530537.

It is an arithmetic number, because the mean of its divisors is an integer number (5303571537).

Almost surely, 2^21211232033 is an apocalyptic number.

It is an amenable number.

21211232033 is a deficient number, since it is larger than the sum of its proper divisors (3054115).

21211232033 is an equidigital number, since it uses as much as digits as its factorization.

21211232033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3054114.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21211232033 its reverse (33023211212), we get a palindrome (54234443245).

The spelling of 21211232033 in words is "twenty-one billion, two hundred eleven million, two hundred thirty-two thousand, thirty-three".