21323123030 has 32 divisors (see below), whose sum is σ = 42285444768. Its totient is φ = 7677088000.

The previous prime is 21323122993. The next prime is 21323123033. The reversal of 21323123030 is 3032132312.

It is a junction number, because it is equal to n+sod(n) for n = 21323122993 and 21323123011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21323123033) 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, 948527 + ... + 970746.

It is an arithmetic number, because the mean of its divisors is an integer number (1321420149).

Almost surely, 2^21323123030 is an apocalyptic number.

21323123030 is a deficient number, since it is larger than the sum of its proper divisors (20962321738).

21323123030 is a wasteful number, since it uses less digits than its factorization.

21323123030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1919392.

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 21323123030 its reverse (3032132312), we get a palindrome (24355255342).

The spelling of 21323123030 in words is "twenty-one billion, three hundred twenty-three million, one hundred twenty-three thousand, thirty".