21321133131 has 8 divisors (see below), whose sum is σ = 28439464144. Its totient is φ = 14208445440.

The previous prime is 21321133129. The next prime is 21321133231. The reversal of 21321133131 is 13133112312.

It is a happy number.

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

It is not a de Polignac number, because 21321133131 - 2¹ = 21321133129 is a prime.

It is a super-2 number, since 2×21321133131² (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 = 21321133098 and 21321133107.

It is not an unprimeable number, because it can be changed into a prime (21321133111) 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, 1402006 + ... + 1417131.

It is an arithmetic number, because the mean of its divisors is an integer number (3554933018).

Almost surely, 2^21321133131 is an apocalyptic number.

21321133131 is a deficient number, since it is larger than the sum of its proper divisors (7118331013).

21321133131 is a wasteful number, since it uses less digits than its factorization.

21321133131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2821661.

The product of its digits is 324, while the sum is 21.

Adding to 21321133131 its reverse (13133112312), we get a palindrome (34454245443).

The spelling of 21321133131 in words is "twenty-one billion, three hundred twenty-one million, one hundred thirty-three thousand, one hundred thirty-one".