21220033291 has 2 divisors, whose sum is σ = 21220033292. Its totient is φ = 21220033290.

The previous prime is 21220033273. The next prime is 21220033333. The reversal of 21220033291 is 19233002212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21220033291 - 2¹⁷ = 21219902219 is a prime.

It is a super-2 number, since 2×21220033291² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21220033591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610016645 + 10610016646.

It is an arithmetic number, because the mean of its divisors is an integer number (10610016646).

Almost surely, 2^21220033291 is an apocalyptic number.

21220033291 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220033291 is an equidigital number, since it uses as much as digits as its factorization.

21220033291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 25.

The spelling of 21220033291 in words is "twenty-one billion, two hundred twenty million, thirty-three thousand, two hundred ninety-one".