21232223291 has 2 divisors, whose sum is σ = 21232223292. Its totient is φ = 21232223290.

The previous prime is 21232223261. The next prime is 21232223297. The reversal of 21232223291 is 19232223212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21232223291 is a prime.

It is not a weakly prime, because it can be changed into another prime (21232223297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10616111645 + 10616111646.

It is an arithmetic number, because the mean of its divisors is an integer number (10616111646).

Almost surely, 2^21232223291 is an apocalyptic number.

21232223291 is a deficient number, since it is larger than the sum of its proper divisors (1).

21232223291 is an equidigital number, since it uses as much as digits as its factorization.

21232223291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 29.

The spelling of 21232223291 in words is "twenty-one billion, two hundred thirty-two million, two hundred twenty-three thousand, two hundred ninety-one".