21101223683 has 2 divisors, whose sum is σ = 21101223684. Its totient is φ = 21101223682.

The previous prime is 21101223641. The next prime is 21101223697. The reversal of 21101223683 is 38632210112.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21101223683 - 2²⁶ = 21034114819 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (21101223383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550611841 + 10550611842.

It is an arithmetic number, because the mean of its divisors is an integer number (10550611842).

Almost surely, 2^21101223683 is an apocalyptic number.

21101223683 is a deficient number, since it is larger than the sum of its proper divisors (1).

21101223683 is an equidigital number, since it uses as much as digits as its factorization.

21101223683 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 29.

Adding to 21101223683 its reverse (38632210112), we get a palindrome (59733433795).

The spelling of 21101223683 in words is "twenty-one billion, one hundred one million, two hundred twenty-three thousand, six hundred eighty-three".