21211102120231 has 2 divisors, whose sum is σ = 21211102120232. Its totient is φ = 21211102120230.

The previous prime is 21211102120211. The next prime is 21211102120237. The reversal of 21211102120231 is 13202120111212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21211102120231 - 2⁹ = 21211102119719 is a prime.

It is a super-2 number, since 2×21211102120231² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21211102120199 and 21211102120208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21211102120237) 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, 10605551060115 + 10605551060116.

It is an arithmetic number, because the mean of its divisors is an integer number (10605551060116).

Almost surely, 2^{21211102120231} is an apocalyptic number.

21211102120231 is a deficient number, since it is larger than the sum of its proper divisors (1).

21211102120231 is an equidigital number, since it uses as much as digits as its factorization.

21211102120231 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 19.

Adding to 21211102120231 its reverse (13202120111212), we get a palindrome (34413222231443).

The spelling of 21211102120231 in words is "twenty-one trillion, two hundred eleven billion, one hundred two million, one hundred twenty thousand, two hundred thirty-one".