21443448131 has 8 divisors (see below), whose sum is σ = 24512117760. Its totient is φ = 18376108488.

The previous prime is 21443448121. The next prime is 21443448137. The reversal of 21443448131 is 13184434412.

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

It is a cyclic number.

It is not a de Polignac number, because 21443448131 - 2¹⁰ = 21443447107 is a prime.

It is a super-2 number, since 2×21443448131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21443448091 and 21443448100.

It is not an unprimeable number, because it can be changed into a prime (21443448137) 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, 297701 + ... + 362646.

It is an arithmetic number, because the mean of its divisors is an integer number (3064014720).

Almost surely, 2^21443448131 is an apocalyptic number.

21443448131 is a deficient number, since it is larger than the sum of its proper divisors (3068669629).

21443448131 is an equidigital number, since it uses as much as digits as its factorization.

21443448131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664993.

The product of its digits is 36864, while the sum is 35.

The spelling of 21443448131 in words is "twenty-one billion, four hundred forty-three million, four hundred forty-eight thousand, one hundred thirty-one".