21323121101111 has 16 divisors (see below), whose sum is σ = 21419308252320. Its totient is φ = 21227167981440.

The previous prime is 21323121101099. The next prime is 21323121101143. The reversal of 21323121101111 is 11110112132312.

It is a cyclic number.

It is not a de Polignac number, because 21323121101111 - 2⁶ = 21323121101047 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 (21323121101311) 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, 693126416 + ... + 693157178.

It is an arithmetic number, because the mean of its divisors is an integer number (1338706765770).

Almost surely, 2^{21323121101111} is an apocalyptic number.

21323121101111 is a deficient number, since it is larger than the sum of its proper divisors (96187151209).

21323121101111 is a wasteful number, since it uses less digits than its factorization.

21323121101111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34466.

The product of its (nonzero) digits is 72, while the sum is 20.

Adding to 21323121101111 its reverse (11110112132312), we get a palindrome (32433233233423).

The spelling of 21323121101111 in words is "twenty-one trillion, three hundred twenty-three billion, one hundred twenty-one million, one hundred one thousand, one hundred eleven".