21514527613 has 4 divisors (see below), whose sum is σ = 21567130780. Its totient is φ = 21461924448.

The previous prime is 21514527607. The next prime is 21514527631. The reversal of 21514527613 is 31672541512.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20816141284 + 698386329 = 144278^2 + 26427^2 .

It is a cyclic number.

It is not a de Polignac number, because 21514527613 - 2⁵ = 21514527581 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21514527653) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26300970 + ... + 26301787.

It is an arithmetic number, because the mean of its divisors is an integer number (5391782695).

Almost surely, 2^21514527613 is an apocalyptic number.

It is an amenable number.

21514527613 is a deficient number, since it is larger than the sum of its proper divisors (52603167).

21514527613 is an equidigital number, since it uses as much as digits as its factorization.

21514527613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52603166.

The product of its digits is 50400, while the sum is 37.

The spelling of 21514527613 in words is "twenty-one billion, five hundred fourteen million, five hundred twenty-seven thousand, six hundred thirteen".