21244431441 has 8 divisors (see below), whose sum is σ = 28363629184. Its totient is φ = 14144094000.

The previous prime is 21244431427. The next prime is 21244431493. The reversal of 21244431441 is 14413444212.

It is a happy number.

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

It is not a de Polignac number, because 21244431441 - 2²³ = 21236042833 is a prime.

It is a super-3 number, since 3×21244431441³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21244431399 and 21244431408.

It is not an unprimeable number, because it can be changed into a prime (21244431421) 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, 4712446 + ... + 4716951.

It is an arithmetic number, because the mean of its divisors is an integer number (3545453648).

Almost surely, 2^21244431441 is an apocalyptic number.

It is an amenable number.

21244431441 is a deficient number, since it is larger than the sum of its proper divisors (7119197743).

21244431441 is an equidigital number, since it uses as much as digits as its factorization.

21244431441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9430151.

The product of its digits is 12288, while the sum is 30.

Adding to 21244431441 its reverse (14413444212), we get a palindrome (35657875653).

The spelling of 21244431441 in words is "twenty-one billion, two hundred forty-four million, four hundred thirty-one thousand, four hundred forty-one".