21440203342431 has 8 divisors (see below), whose sum is σ = 28587818411904. Its totient is φ = 14293028583960.

The previous prime is 21440203342423. The next prime is 21440203342471. The reversal of 21440203342431 is 13424330204412.

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

It is not a de Polignac number, because 21440203342431 - 2³ = 21440203342423 is a prime.

It is a super-2 number, since 2×21440203342431² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21440203342392 and 21440203342401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21440203342421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109964115 + ... + 110158916.

It is an arithmetic number, because the mean of its divisors is an integer number (3573477301488).

Almost surely, 2^{21440203342431} is an apocalyptic number.

21440203342431 is a deficient number, since it is larger than the sum of its proper divisors (7147615069473).

21440203342431 is a wasteful number, since it uses less digits than its factorization.

21440203342431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220155501.

The product of its (nonzero) digits is 55296, while the sum is 33.

Adding to 21440203342431 its reverse (13424330204412), we get a palindrome (34864533546843).

The spelling of 21440203342431 in words is "twenty-one trillion, four hundred forty billion, two hundred three million, three hundred forty-two thousand, four hundred thirty-one".