21426131271 has 16 divisors (see below), whose sum is σ = 30271999968. Its totient is φ = 13433472000.

The previous prime is 21426131267. The next prime is 21426131317. The reversal of 21426131271 is 17213162412.

It is not a de Polignac number, because 21426131271 - 2² = 21426131267 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21426131471) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 95110 + ... + 227811.

It is an arithmetic number, because the mean of its divisors is an integer number (1891999998).

Almost surely, 2^21426131271 is an apocalyptic number.

21426131271 is a deficient number, since it is larger than the sum of its proper divisors (8845868697).

21426131271 is a wasteful number, since it uses less digits than its factorization.

21426131271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324242.

The product of its digits is 4032, while the sum is 30.

Adding to 21426131271 its reverse (17213162412), we get a palindrome (38639293683).

The spelling of 21426131271 in words is "twenty-one billion, four hundred twenty-six million, one hundred thirty-one thousand, two hundred seventy-one".