211221023399 has 2 divisors, whose sum is σ = 211221023400. Its totient is φ = 211221023398.

The previous prime is 211221023291. The next prime is 211221023401. The reversal of 211221023399 is 993320122112.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211221023399 is a prime.

It is a super-2 number, since 2×211221023399² (a number of 23 digits) contains 22 as substring.

Together with 211221023401, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211221023899) 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 as a sum of consecutive naturals, namely, 105610511699 + 105610511700.

It is an arithmetic number, because the mean of its divisors is an integer number (105610511700).

Almost surely, 2^211221023399 is an apocalyptic number.

211221023399 is a deficient number, since it is larger than the sum of its proper divisors (1).

211221023399 is an equidigital number, since it uses as much as digits as its factorization.

211221023399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 35.

The spelling of 211221023399 in words is "two hundred eleven billion, two hundred twenty-one million, twenty-three thousand, three hundred ninety-nine".