21202112210231 has 2 divisors, whose sum is σ = 21202112210232. Its totient is φ = 21202112210230.

The previous prime is 21202112210137. The next prime is 21202112210239. The reversal of 21202112210231 is 13201221120212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21202112210231 is a prime.

It is a super-2 number, since 2×21202112210231² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21202112210239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601056105115 + 10601056105116.

It is an arithmetic number, because the mean of its divisors is an integer number (10601056105116).

Almost surely, 2^{21202112210231} is an apocalyptic number.

21202112210231 is a deficient number, since it is larger than the sum of its proper divisors (1).

21202112210231 is an equidigital number, since it uses as much as digits as its factorization.

21202112210231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 21202112210231 its reverse (13201221120212), we get a palindrome (34403333330443).

The spelling of 21202112210231 in words is "twenty-one trillion, two hundred two billion, one hundred twelve million, two hundred ten thousand, two hundred thirty-one".