21120001323 has 64 divisors (see below), whose sum is σ = 32145984000. Its totient is φ = 12252764160.

The previous prime is 21120001283. The next prime is 21120001327. The reversal of 21120001323 is 32310002112.

It is not a de Polignac number, because 21120001323 - 2¹⁰ = 21120000299 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21120001327) 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 63 ways as a sum of consecutive naturals, for example, 10835353 + ... + 10837301.

It is an arithmetic number, because the mean of its divisors is an integer number (502281000).

Almost surely, 2^21120001323 is an apocalyptic number.

21120001323 is a deficient number, since it is larger than the sum of its proper divisors (11025982677).

21120001323 is a wasteful number, since it uses less digits than its factorization.

21120001323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2252.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21120001323 its reverse (32310002112), we get a palindrome (53430003435).

The spelling of 21120001323 in words is "twenty-one billion, one hundred twenty million, one thousand, three hundred twenty-three".