21013135331 has 8 divisors (see below), whose sum is σ = 21070392000. Its totient is φ = 20955908160.

The previous prime is 21013135327. The next prime is 21013135343. The reversal of 21013135331 is 13353131012.

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

It is a cyclic number.

It is not a de Polignac number, because 21013135331 - 2² = 21013135327 is a prime.

It is a super-2 number, since 2×21013135331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21013135297 and 21013135306.

It is not an unprimeable number, because it can be changed into a prime (21013135531) 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 7 ways as a sum of consecutive naturals, for example, 2855645 + ... + 2862993.

It is an arithmetic number, because the mean of its divisors is an integer number (2633799000).

Almost surely, 2^21013135331 is an apocalyptic number.

21013135331 is a deficient number, since it is larger than the sum of its proper divisors (57256669).

21013135331 is an equidigital number, since it uses as much as digits as its factorization.

21013135331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14749.

The product of its (nonzero) digits is 810, while the sum is 23.

Adding to 21013135331 its reverse (13353131012), we get a palindrome (34366266343).

The spelling of 21013135331 in words is "twenty-one billion, thirteen million, one hundred thirty-five thousand, three hundred thirty-one".