21211222033 has 4 divisors (see below), whose sum is σ = 22327602160. Its totient is φ = 20094841908.

The previous prime is 21211221991. The next prime is 21211222051. The reversal of 21211222033 is 33022211212.

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 a de Polignac number, because none of the positive numbers 2^k-21211222033 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 1116380107 = 21211222033 / (2 + 1 + 2 + 1 + 1 + 2 + 2 + 2 + 0 + 3 + 3).

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 21211222033.

It is not an unprimeable number, because it can be changed into a prime (21211222063) 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, 558190035 + ... + 558190072.

It is an arithmetic number, because the mean of its divisors is an integer number (5581900540).

Almost surely, 2^21211222033 is an apocalyptic number.

It is an amenable number.

21211222033 is a deficient number, since it is larger than the sum of its proper divisors (1116380127).

21211222033 is a wasteful number, since it uses less digits than its factorization.

21211222033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1116380126.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21211222033 its reverse (33022211212), we get a palindrome (54233433245).

The spelling of 21211222033 in words is "twenty-one billion, two hundred eleven million, two hundred twenty-two thousand, thirty-three".