21000323323 has 12 divisors (see below), whose sum is σ = 24491769120. Its totient is φ = 17953987632.

The previous prime is 21000323303. The next prime is 21000323341. The reversal of 21000323323 is 32332300012.

It is a happy number.

It is not a de Polignac number, because 21000323323 - 2¹³ = 21000315131 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21000323323.

It is not an unprimeable number, because it can be changed into a prime (21000323303) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 531811 + ... + 569932.

It is an arithmetic number, because the mean of its divisors is an integer number (2040980760).

Almost surely, 2^21000323323 is an apocalyptic number.

21000323323 is a deficient number, since it is larger than the sum of its proper divisors (3491445797).

21000323323 is a wasteful number, since it uses less digits than its factorization.

21000323323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1102146 (or 1102139 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 19.

Adding to 21000323323 its reverse (32332300012), we get a palindrome (53332623335).

The spelling of 21000323323 in words is "twenty-one billion, three hundred twenty-three thousand, three hundred twenty-three".