21265411431 has 16 divisors (see below), whose sum is σ = 31116734208. Its totient is φ = 12810950400.

The previous prime is 21265411379. The next prime is 21265411451. The reversal of 21265411431 is 13411456212.

It is not a de Polignac number, because 21265411431 - 2⁷ = 21265411303 is a prime.

It is a super-2 number, since 2×21265411431² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21265411451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1923850 + ... + 1934871.

It is an arithmetic number, because the mean of its divisors is an integer number (1944795888).

Almost surely, 2^21265411431 is an apocalyptic number.

21265411431 is a deficient number, since it is larger than the sum of its proper divisors (9851322777).

21265411431 is a wasteful number, since it uses less digits than its factorization.

21265411431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3858902.

The product of its digits is 5760, while the sum is 30.

Adding to 21265411431 its reverse (13411456212), we get a palindrome (34676867643).

The spelling of 21265411431 in words is "twenty-one billion, two hundred sixty-five million, four hundred eleven thousand, four hundred thirty-one".