21464323117 has 16 divisors (see below), whose sum is σ = 22842494640. Its totient is φ = 20130550272.

The previous prime is 21464323109. The next prime is 21464323121. The reversal of 21464323117 is 71132346412.

It can be written as a sum of positive squares in 8 ways, for example, as 12033961 + 21452289156 = 3469^2 + 146466^2 .

It is a cyclic number.

It is not a de Polignac number, because 21464323117 - 2³ = 21464323109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21464323217) 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, 641433 + ... + 674065.

It is an arithmetic number, because the mean of its divisors is an integer number (1427655915).

Almost surely, 2^21464323117 is an apocalyptic number.

It is an amenable number.

21464323117 is a deficient number, since it is larger than the sum of its proper divisors (1378171523).

21464323117 is a wasteful number, since it uses less digits than its factorization.

21464323117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33312.

The product of its digits is 24192, while the sum is 34.

Adding to 21464323117 its reverse (71132346412), we get a palindrome (92596669529).

The spelling of 21464323117 in words is "twenty-one billion, four hundred sixty-four million, three hundred twenty-three thousand, one hundred seventeen".