21001110122231 has 2 divisors, whose sum is σ = 21001110122232. Its totient is φ = 21001110122230.

The previous prime is 21001110122171. The next prime is 21001110122273. The reversal of 21001110122231 is 13222101110012.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21001110122231 - 2³⁴ = 20983930253047 is a prime.

It is a super-2 number, since 2×21001110122231² (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 (21001110124231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500555061115 + 10500555061116.

It is an arithmetic number, because the mean of its divisors is an integer number (10500555061116).

Almost surely, 2^{21001110122231} is an apocalyptic number.

21001110122231 is a deficient number, since it is larger than the sum of its proper divisors (1).

21001110122231 is an equidigital number, since it uses as much as digits as its factorization.

21001110122231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 21001110122231 its reverse (13222101110012), we get a palindrome (34223211232243).

The spelling of 21001110122231 in words is "twenty-one trillion, one billion, one hundred ten million, one hundred twenty-two thousand, two hundred thirty-one".