21443114431 has 32 divisors (see below), whose sum is σ = 23058846720. Its totient is φ = 19902892800.

The previous prime is 21443114417. The next prime is 21443114453. The reversal of 21443114431 is 13441134412.

It is a cyclic number.

It is not a de Polignac number, because 21443114431 - 2¹³ = 21443106239 is a prime.

It is a super-2 number, since 2×21443114431² (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 21443114431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21443114471) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 38086956 + ... + 38087518.

It is an arithmetic number, because the mean of its divisors is an integer number (720588960).

Almost surely, 2^21443114431 is an apocalyptic number.

21443114431 is a deficient number, since it is larger than the sum of its proper divisors (1615732289).

21443114431 is a wasteful number, since it uses less digits than its factorization.

21443114431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1047.

The product of its digits is 4608, while the sum is 28.

Adding to 21443114431 its reverse (13441134412), we get a palindrome (34884248843).

The spelling of 21443114431 in words is "twenty-one billion, four hundred forty-three million, one hundred fourteen thousand, four hundred thirty-one".