21231222013111 has 16 divisors (see below), whose sum is σ = 23607256232448. Its totient is φ = 18929783527200.

The previous prime is 21231222013091. The next prime is 21231222013153. The reversal of 21231222013111 is 11131022213212.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21231222013111 - 2¹⁹ = 21231221488823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21231222013511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5335755 + ... + 8422156.

It is an arithmetic number, because the mean of its divisors is an integer number (1475453514528).

Almost surely, 2^{21231222013111} is an apocalyptic number.

21231222013111 is a deficient number, since it is larger than the sum of its proper divisors (2376034219337).

21231222013111 is a wasteful number, since it uses less digits than its factorization.

21231222013111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13760622.

The product of its (nonzero) digits is 288, while the sum is 22.

Adding to 21231222013111 its reverse (11131022213212), we get a palindrome (32362244226323).

The spelling of 21231222013111 in words is "twenty-one trillion, two hundred thirty-one billion, two hundred twenty-two million, thirteen thousand, one hundred eleven".