21221231033 has 4 divisors (see below), whose sum is σ = 21316393728. Its totient is φ = 21126068340.

The previous prime is 21221231029. The next prime is 21221231047. The reversal of 21221231033 is 33013212212.

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 21221231033 - 2² = 21221231029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21221230996 and 21221231014.

It is not an unprimeable number, because it can be changed into a prime (21221231093) 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 3 ways as a sum of consecutive naturals, for example, 47581013 + ... + 47581458.

It is an arithmetic number, because the mean of its divisors is an integer number (5329098432).

Almost surely, 2^21221231033 is an apocalyptic number.

It is an amenable number.

21221231033 is a deficient number, since it is larger than the sum of its proper divisors (95162695).

21221231033 is an equidigital number, since it uses as much as digits as its factorization.

21221231033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95162694.

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

Adding to 21221231033 its reverse (33013212212), we get a palindrome (54234443245).

The spelling of 21221231033 in words is "twenty-one billion, two hundred twenty-one million, two hundred thirty-one thousand, thirty-three".