21222033331 has 4 divisors (see below), whose sum is σ = 21222678672. Its totient is φ = 21221387992.

The previous prime is 21222033293. The next prime is 21222033397. The reversal of 21222033331 is 13333022212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21222033331 - 2¹⁵ = 21222000563 is a prime.

It is a super-2 number, since 2×21222033331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21222033431) 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, 270535 + ... + 340048.

It is an arithmetic number, because the mean of its divisors is an integer number (5305669668).

Almost surely, 2^21222033331 is an apocalyptic number.

21222033331 is a deficient number, since it is larger than the sum of its proper divisors (645341).

21222033331 is an equidigital number, since it uses as much as digits as its factorization.

21222033331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645340.

The product of its (nonzero) digits is 1296, while the sum is 22.

Adding to 21222033331 its reverse (13333022212), we get a palindrome (34555055543).

The spelling of 21222033331 in words is "twenty-one billion, two hundred twenty-two million, thirty-three thousand, three hundred thirty-one".