21443132044 has 72 divisors (see below), whose sum is σ = 39641172480. Its totient is φ = 10140875904.

The previous prime is 21443131987. The next prime is 21443132059. The reversal of 21443132044 is 44023134412.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 156519144 + ... + 156519280.

It is an arithmetic number, because the mean of its divisors is an integer number (550571840).

Almost surely, 2^21443132044 is an apocalyptic number.

It is an amenable number.

21443132044 is a deficient number, since it is larger than the sum of its proper divisors (18198040436).

21443132044 is a wasteful number, since it uses less digits than its factorization.

21443132044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487 (or 348 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 21443132044 its reverse (44023134412), we get a palindrome (65466266456).

The spelling of 21443132044 in words is "twenty-one billion, four hundred forty-three million, one hundred thirty-two thousand, forty-four".