21357132513 has 4 divisors (see below), whose sum is σ = 28476176688. Its totient is φ = 14238088340.

The previous prime is 21357132481. The next prime is 21357132541. The reversal of 21357132513 is 31523175312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21357132513 - 2⁵ = 21357132481 is a prime.

It is a super-2 number, since 2×21357132513² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21357132613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3559522083 + ... + 3559522088.

It is an arithmetic number, because the mean of its divisors is an integer number (7119044172).

Almost surely, 2^21357132513 is an apocalyptic number.

It is an amenable number.

21357132513 is a deficient number, since it is larger than the sum of its proper divisors (7119044175).

21357132513 is an equidigital number, since it uses as much as digits as its factorization.

21357132513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7119044174.

The product of its digits is 18900, while the sum is 33.

The spelling of 21357132513 in words is "twenty-one billion, three hundred fifty-seven million, one hundred thirty-two thousand, five hundred thirteen".