21202210231 has 2 divisors, whose sum is σ = 21202210232. Its totient is φ = 21202210230.

The previous prime is 21202210217. The next prime is 21202210241. The reversal of 21202210231 is 13201220212.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21202210231 - 2³¹ = 19054726583 is a prime.

It is a super-2 number, since 2×21202210231² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21202210241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601105115 + 10601105116.

It is an arithmetic number, because the mean of its divisors is an integer number (10601105116).

Almost surely, 2^21202210231 is an apocalyptic number.

21202210231 is a deficient number, since it is larger than the sum of its proper divisors (1).

21202210231 is an equidigital number, since it uses as much as digits as its factorization.

21202210231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21202210231 its reverse (13201220212), we get a palindrome (34403430443).

The spelling of 21202210231 in words is "twenty-one billion, two hundred two million, two hundred ten thousand, two hundred thirty-one".