21271336513 has 32 divisors (see below), whose sum is σ = 27374457600. Its totient is φ = 16089145344.

The previous prime is 21271336501. The next prime is 21271336561. The reversal of 21271336513 is 31563317212.

It is a cyclic number.

It is not a de Polignac number, because 21271336513 - 2⁵ = 21271336481 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21271336013) 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, 170823 + ... + 267811.

It is an arithmetic number, because the mean of its divisors is an integer number (855451800).

Almost surely, 2^21271336513 is an apocalyptic number.

It is an amenable number.

21271336513 is a deficient number, since it is larger than the sum of its proper divisors (6103121087).

21271336513 is a wasteful number, since it uses less digits than its factorization.

21271336513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97129.

The product of its digits is 22680, while the sum is 34.

The spelling of 21271336513 in words is "twenty-one billion, two hundred seventy-one million, three hundred thirty-six thousand, five hundred thirteen".