21101031323 has 2 divisors, whose sum is σ = 21101031324. Its totient is φ = 21101031322.

The previous prime is 21101031293. The next prime is 21101031379. The reversal of 21101031323 is 32313010112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21101031323 - 2¹⁰ = 21101030299 is a prime.

It is not a weakly prime, because it can be changed into another prime (21101031923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550515661 + 10550515662.

It is an arithmetic number, because the mean of its divisors is an integer number (10550515662).

Almost surely, 2^21101031323 is an apocalyptic number.

21101031323 is a deficient number, since it is larger than the sum of its proper divisors (1).

21101031323 is an equidigital number, since it uses as much as digits as its factorization.

21101031323 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 21101031323 its reverse (32313010112), we get a palindrome (53414041435).

The spelling of 21101031323 in words is "twenty-one billion, one hundred one million, thirty-one thousand, three hundred twenty-three".