21131111212323 has 64 divisors (see below), whose sum is σ = 34179498823680. Its totient is φ = 11343618000000.

The previous prime is 21131111212303. The next prime is 21131111212327. The reversal of 21131111212323 is 32321211113112.

It is not a de Polignac number, because 21131111212323 - 2¹⁶ = 21131111146787 is a prime.

It is a super-2 number, since 2×21131111212323² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21131111212293 and 21131111212302.

It is not an unprimeable number, because it can be changed into a prime (21131111212327) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 22269073 + ... + 23198573.

It is an arithmetic number, because the mean of its divisors is an integer number (534054669120).

Almost surely, 2^{21131111212323} is an apocalyptic number.

21131111212323 is a deficient number, since it is larger than the sum of its proper divisors (13048387611357).

21131111212323 is a wasteful number, since it uses less digits than its factorization.

21131111212323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 930008.

The product of its digits is 432, while the sum is 24.

Adding to 21131111212323 its reverse (32321211113112), we get a palindrome (53452322325435).

The spelling of 21131111212323 in words is "twenty-one trillion, one hundred thirty-one billion, one hundred eleven million, two hundred twelve thousand, three hundred twenty-three".