21232032444 has 48 divisors (see below), whose sum is σ = 62909728000. Its totient is φ = 6066294768.

The previous prime is 21232032439. The next prime is 21232032457. The reversal of 21232032444 is 44423023212.

21232032444 is a `hidden beast` number, since 2 + 12 + 3 + 203 + 2 + 444 = 666.

It is a super-2 number, since 2×21232032444² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14041594 + ... + 14043105.

Almost surely, 2^21232032444 is an apocalyptic number.

It is an amenable number.

21232032444 is an abundant number, since it is smaller than the sum of its proper divisors (41677695556).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21232032444 is a wasteful number, since it uses less digits than its factorization.

21232032444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28084719 (or 28084711 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 27.

Adding to 21232032444 its reverse (44423023212), we get a palindrome (65655055656).

The spelling of 21232032444 in words is "twenty-one billion, two hundred thirty-two million, thirty-two thousand, four hundred forty-four".