21440131347 has 8 divisors (see below), whose sum is σ = 28587808144. Its totient is φ = 14292937728.

The previous prime is 21440131327. The next prime is 21440131357. The reversal of 21440131347 is 74313104412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21440131347 - 2⁸ = 21440131091 is a prime.

It is a super-2 number, since 2×21440131347² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21440131327) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3 + ... + 207075.

It is an arithmetic number, because the mean of its divisors is an integer number (3573476018).

Almost surely, 2^21440131347 is an apocalyptic number.

21440131347 is a deficient number, since it is larger than the sum of its proper divisors (7147676797).

21440131347 is a wasteful number, since it uses less digits than its factorization.

21440131347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241589.

The product of its (nonzero) digits is 8064, while the sum is 30.

Adding to 21440131347 its reverse (74313104412), we get a palindrome (95753235759).

The spelling of 21440131347 in words is "twenty-one billion, four hundred forty million, one hundred thirty-one thousand, three hundred forty-seven".