21440203131 has 8 divisors (see below), whose sum is σ = 28605398800. Its totient is φ = 14284238112.

The previous prime is 21440203097. The next prime is 21440203133. The reversal of 21440203131 is 13130204412.

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

It is not a de Polignac number, because 21440203131 - 2⁶ = 21440203067 is a prime.

It is a super-2 number, since 2×21440203131² (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 = 21440203098 and 21440203107.

It is not an unprimeable number, because it can be changed into a prime (21440203133) 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, 2302240 + ... + 2311533.

It is an arithmetic number, because the mean of its divisors is an integer number (3575674850).

Almost surely, 2^21440203131 is an apocalyptic number.

21440203131 is a deficient number, since it is larger than the sum of its proper divisors (7165195669).

21440203131 is a wasteful number, since it uses less digits than its factorization.

21440203131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4615325.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21440203131 its reverse (13130204412), we get a palindrome (34570407543).

The spelling of 21440203131 in words is "twenty-one billion, four hundred forty million, two hundred three thousand, one hundred thirty-one".