21232471623 has 16 divisors (see below), whose sum is σ = 32700278016. Its totient is φ = 12111213440.

The previous prime is 21232471583. The next prime is 21232471639. The reversal of 21232471623 is 32617423212.

It is not a de Polignac number, because 21232471623 - 2¹⁰ = 21232470599 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21232476623) 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, 18923211 + ... + 18924332.

It is an arithmetic number, because the mean of its divisors is an integer number (2043767376).

Almost surely, 2^21232471623 is an apocalyptic number.

21232471623 is a deficient number, since it is larger than the sum of its proper divisors (11467806393).

21232471623 is a wasteful number, since it uses less digits than its factorization.

21232471623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37847574.

The product of its digits is 24192, while the sum is 33.

Adding to 21232471623 its reverse (32617423212), we get a palindrome (53849894835).

The spelling of 21232471623 in words is "twenty-one billion, two hundred thirty-two million, four hundred seventy-one thousand, six hundred twenty-three".