21000010323 has 32 divisors (see below), whose sum is σ = 29137075200. Its totient is φ = 13437446400.

The previous prime is 21000010313. The next prime is 21000010327. The reversal of 21000010323 is 32301000012.

It is a happy number.

It is not a de Polignac number, because 21000010323 - 2⁴ = 21000010307 is a prime.

It is a super-2 number, since 2×21000010323² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21000010299 and 21000010308.

It is not an unprimeable number, because it can be changed into a prime (21000010327) 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 in 31 ways as a sum of consecutive naturals, for example, 16291063 + ... + 16292351.

It is an arithmetic number, because the mean of its divisors is an integer number (910533600).

Almost surely, 2^21000010323 is an apocalyptic number.

21000010323 is a deficient number, since it is larger than the sum of its proper divisors (8137064877).

21000010323 is a wasteful number, since it uses less digits than its factorization.

21000010323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2283.

The product of its (nonzero) digits is 36, while the sum is 12.

Adding to 21000010323 its reverse (32301000012), we get a palindrome (53301010335).

The spelling of 21000010323 in words is "twenty-one billion, ten thousand, three hundred twenty-three".