21232021033 has 4 divisors (see below), whose sum is σ = 21725789008. Its totient is φ = 20738253060.

The previous prime is 21232021009. The next prime is 21232021039. The reversal of 21232021033 is 33012023212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21232021033 - 2⁵ = 21232021001 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21232021033.

It is not an unprimeable number, because it can be changed into a prime (21232021039) 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, 246883923 + ... + 246884008.

It is an arithmetic number, because the mean of its divisors is an integer number (5431447252).

Almost surely, 2^21232021033 is an apocalyptic number.

It is an amenable number.

21232021033 is a deficient number, since it is larger than the sum of its proper divisors (493767975).

21232021033 is an equidigital number, since it uses as much as digits as its factorization.

21232021033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493767974.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21232021033 its reverse (33012023212), we get a palindrome (54244044245).

The spelling of 21232021033 in words is "twenty-one billion, two hundred thirty-two million, twenty-one thousand, thirty-three".