21523444232 has 16 divisors (see below), whose sum is σ = 40404571200. Its totient is φ = 10748891920.

The previous prime is 21523444223. The next prime is 21523444249. The reversal of 21523444232 is 23244432512.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1596644 + ... + 1610067.

It is an arithmetic number, because the mean of its divisors is an integer number (2525285700).

Almost surely, 2^21523444232 is an apocalyptic number.

It is an amenable number.

21523444232 is a deficient number, since it is larger than the sum of its proper divisors (18881126968).

21523444232 is a wasteful number, since it uses less digits than its factorization.

21523444232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3207556 (or 3207552 counting only the distinct ones).

The product of its digits is 46080, while the sum is 32.

Adding to 21523444232 its reverse (23244432512), we get a palindrome (44767876744).

The spelling of 21523444232 in words is "twenty-one billion, five hundred twenty-three million, four hundred forty-four thousand, two hundred thirty-two".