21244433131 has 8 divisors (see below), whose sum is σ = 21274553664. Its totient is φ = 21214334280.

The previous prime is 21244433101. The next prime is 21244433137. The reversal of 21244433131 is 13133444212.

It is a happy number.

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 21244433131 - 2⁵ = 21244433099 is a prime.

It is a super-2 number, since 2×21244433131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21244433131.

It is not an unprimeable number, because it can be changed into a prime (21244433137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3054600 + ... + 3061546.

It is an arithmetic number, because the mean of its divisors is an integer number (2659319208).

Almost surely, 2^21244433131 is an apocalyptic number.

21244433131 is a deficient number, since it is larger than the sum of its proper divisors (30120533).

21244433131 is a wasteful number, since it uses less digits than its factorization.

21244433131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10841.

The product of its digits is 6912, while the sum is 28.

Adding to 21244433131 its reverse (13133444212), we get a palindrome (34377877343).

The spelling of 21244433131 in words is "twenty-one billion, two hundred forty-four million, four hundred thirty-three thousand, one hundred thirty-one".