21221011033 has 4 divisors (see below), whose sum is σ = 21905559808. Its totient is φ = 20536462260.

The previous prime is 21221010997. The next prime is 21221011069. The reversal of 21221011033 is 33011012212.

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 an interprime number because it is at equal distance from previous prime (21221010997) and next prime (21221011069).

It is a cyclic number.

It is not a de Polignac number, because 21221011033 - 2¹³ = 21221002841 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21221010998 and 21221011016.

It is not an unprimeable number, because it can be changed into a prime (21221011633) 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, 342274341 + ... + 342274402.

It is an arithmetic number, because the mean of its divisors is an integer number (5476389952).

Almost surely, 2^21221011033 is an apocalyptic number.

It is an amenable number.

21221011033 is a deficient number, since it is larger than the sum of its proper divisors (684548775).

21221011033 is an equidigital number, since it uses as much as digits as its factorization.

21221011033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 684548774.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21221011033 its reverse (33011012212), we get a palindrome (54232023245).

The spelling of 21221011033 in words is "twenty-one billion, two hundred twenty-one million, eleven thousand, thirty-three".