21011131323 has 192 divisors, whose sum is σ = 41759477760. Its totient is φ = 10246497408.

The previous prime is 21011131223. The next prime is 21011131343. The reversal of 21011131323 is 32313111012.

21011131323 is a `hidden beast` number, since 210 + 1 + 1 + 131 + 323 = 666.

It is not a de Polignac number, because 21011131323 - 2¹⁴ = 21011114939 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21011131296 and 21011131305.

It is not an unprimeable number, because it can be changed into a prime (21011131343) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 18065740 + ... + 18066902.

It is an arithmetic number, because the mean of its divisors is an integer number (217497280).

Almost surely, 2^21011131323 is an apocalyptic number.

21011131323 is a deficient number, since it is larger than the sum of its proper divisors (20748346437).

21011131323 is a wasteful number, since it uses less digits than its factorization.

21011131323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1260 (or 1248 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 21011131323 its reverse (32313111012), we get a palindrome (53324242335).

The spelling of 21011131323 in words is "twenty-one billion, eleven million, one hundred thirty-one thousand, three hundred twenty-three".