21022001233 has 4 divisors (see below), whose sum is σ = 21022345908. Its totient is φ = 21021656560.

The previous prime is 21022001227. The next prime is 21022001237. The reversal of 21022001233 is 33210022012.

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 8497705489 + 12524295744 = 92183^2 + 111912^2 .

It is a cyclic number.

It is not a de Polignac number, because 21022001233 - 2²⁹ = 20485130321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21022001237) 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, 53566 + ... + 211927.

It is an arithmetic number, because the mean of its divisors is an integer number (5255586477).

Almost surely, 2^21022001233 is an apocalyptic number.

It is an amenable number.

21022001233 is a deficient number, since it is larger than the sum of its proper divisors (344675).

21022001233 is an equidigital number, since it uses as much as digits as its factorization.

21022001233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344674.

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21022001233 its reverse (33210022012), we get a palindrome (54232023245).

The spelling of 21022001233 in words is "twenty-one billion, twenty-two million, one thousand, two hundred thirty-three".