21220111033 has 4 divisors (see below), whose sum is σ = 23149212048. Its totient is φ = 19291010020.

The previous prime is 21220111027. The next prime is 21220111061. The reversal of 21220111033 is 33011102212.

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-21220111033 is a prime.

It is a super-2 number, since 2×21220111033² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21220110998 and 21220111016.

It is not an unprimeable number, because it can be changed into a prime (21220111063) 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, 964550491 + ... + 964550512.

It is an arithmetic number, because the mean of its divisors is an integer number (5787303012).

Almost surely, 2^21220111033 is an apocalyptic number.

It is an amenable number.

21220111033 is a deficient number, since it is larger than the sum of its proper divisors (1929101015).

21220111033 is a wasteful number, since it uses less digits than its factorization.

21220111033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1929101014.

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

Adding to 21220111033 its reverse (33011102212), we get a palindrome (54231213245).

The spelling of 21220111033 in words is "twenty-one billion, two hundred twenty million, one hundred eleven thousand, thirty-three".