21135321512511 has 8 divisors (see below), whose sum is σ = 28184075721984. Its totient is φ = 14088390822360.

The previous prime is 21135321512477. The next prime is 21135321512531. The reversal of 21135321512511 is 11521512353112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21135321512511 - 2¹⁰ = 21135321511487 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21135321512531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 455852785 + ... + 455899146.

It is an arithmetic number, because the mean of its divisors is an integer number (3523009465248).

Almost surely, 2^{21135321512511} is an apocalyptic number.

21135321512511 is a deficient number, since it is larger than the sum of its proper divisors (7048754209473).

21135321512511 is an equidigital number, since it uses as much as digits as its factorization.

21135321512511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 911759661.

The product of its digits is 9000, while the sum is 33.

Adding to 21135321512511 its reverse (11521512353112), we get a palindrome (32656833865623).

The spelling of 21135321512511 in words is "twenty-one trillion, one hundred thirty-five billion, three hundred twenty-one million, five hundred twelve thousand, five hundred eleven".