21044132347 has 16 divisors (see below), whose sum is σ = 25354771200. Its totient is φ = 17062466400.

The previous prime is 21044132341. The next prime is 21044132377. The reversal of 21044132347 is 74323144012.

It is not a de Polignac number, because 21044132347 - 2³ = 21044132339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21044132341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32404 + ... + 207697.

It is an arithmetic number, because the mean of its divisors is an integer number (1584673200).

Almost surely, 2^21044132347 is an apocalyptic number.

21044132347 is a deficient number, since it is larger than the sum of its proper divisors (4310638853).

21044132347 is a wasteful number, since it uses less digits than its factorization.

21044132347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240786.

The product of its (nonzero) digits is 16128, while the sum is 31.

Adding to 21044132347 its reverse (74323144012), we get a palindrome (95367276359).

The spelling of 21044132347 in words is "twenty-one billion, forty-four million, one hundred thirty-two thousand, three hundred forty-seven".