21210111323 has 8 divisors (see below), whose sum is σ = 21635661360. Its totient is φ = 20787072480.

The previous prime is 21210111311. The next prime is 21210111337. The reversal of 21210111323 is 32311101212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21210111323 - 2⁸ = 21210111067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21210111343) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 610733 + ... + 644526.

It is an arithmetic number, because the mean of its divisors is an integer number (2704457670).

Almost surely, 2^21210111323 is an apocalyptic number.

21210111323 is a deficient number, since it is larger than the sum of its proper divisors (425550037).

21210111323 is a wasteful number, since it uses less digits than its factorization.

21210111323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1255597.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21210111323 its reverse (32311101212), we get a palindrome (53521212535).

The spelling of 21210111323 in words is "twenty-one billion, two hundred ten million, one hundred eleven thousand, three hundred twenty-three".