21101010323 has 4 divisors (see below), whose sum is σ = 21104623800. Its totient is φ = 21097396848.

The previous prime is 21101010251. The next prime is 21101010341. The reversal of 21101010323 is 32301010112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21101010323 - 2³² = 16806043027 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21101010298 and 21101010307.

It is not an unprimeable number, because it can be changed into a prime (21101010373) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1797965 + ... + 1809662.

It is an arithmetic number, because the mean of its divisors is an integer number (5276155950).

Almost surely, 2^21101010323 is an apocalyptic number.

21101010323 is a deficient number, since it is larger than the sum of its proper divisors (3613477).

21101010323 is an equidigital number, since it uses as much as digits as its factorization.

21101010323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3613476.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 21101010323 its reverse (32301010112), we get a palindrome (53402020435).

The spelling of 21101010323 in words is "twenty-one billion, one hundred one million, ten thousand, three hundred twenty-three".