21102012323 has 16 divisors (see below), whose sum is σ = 24264218880. Its totient is φ = 17976823776.

The previous prime is 21102012301. The next prime is 21102012341. The reversal of 21102012323 is 32321020112.

It is a cyclic number.

It is not a de Polignac number, because 21102012323 - 2⁶ = 21102012259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21102012623) 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 15 ways as a sum of consecutive naturals, for example, 3358661 + ... + 3364937.

It is an arithmetic number, because the mean of its divisors is an integer number (1516513680).

Almost surely, 2^21102012323 is an apocalyptic number.

21102012323 is a deficient number, since it is larger than the sum of its proper divisors (3162206557).

21102012323 is a wasteful number, since it uses less digits than its factorization.

21102012323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9146.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21102012323 its reverse (32321020112), we get a palindrome (53423032435).

The spelling of 21102012323 in words is "twenty-one billion, one hundred two million, twelve thousand, three hundred twenty-three".