21203431144111 has 2 divisors, whose sum is σ = 21203431144112. Its totient is φ = 21203431144110.

The previous prime is 21203431144067. The next prime is 21203431144127. The reversal of 21203431144111 is 11144113430212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21203431144111 - 2¹³ = 21203431135919 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21203431144111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21203431114111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601715572055 + 10601715572056.

It is an arithmetic number, because the mean of its divisors is an integer number (10601715572056).

Almost surely, 2^{21203431144111} is an apocalyptic number.

21203431144111 is a deficient number, since it is larger than the sum of its proper divisors (1).

21203431144111 is an equidigital number, since it uses as much as digits as its factorization.

21203431144111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 28.

Adding to 21203431144111 its reverse (11144113430212), we get a palindrome (32347544574323).

The spelling of 21203431144111 in words is "twenty-one trillion, two hundred three billion, four hundred thirty-one million, one hundred forty-four thousand, one hundred eleven".