21011321131 has 8 divisors (see below), whose sum is σ = 21165253200. Its totient is φ = 20857902240.

The previous prime is 21011321129. The next prime is 21011321153. The reversal of 21011321131 is 13112311012.

It is a happy number.

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 21011321131 - 2¹ = 21011321129 is a prime.

It is a super-2 number, since 2×21011321131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21011321231) 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, 45916 + ... + 210073.

It is an arithmetic number, because the mean of its divisors is an integer number (2645656650).

Almost surely, 2^21011321131 is an apocalyptic number.

21011321131 is a deficient number, since it is larger than the sum of its proper divisors (153932069).

21011321131 is a wasteful number, since it uses less digits than its factorization.

21011321131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256589.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 21011321131 its reverse (13112311012), we get a palindrome (34123632143).

The spelling of 21011321131 in words is "twenty-one billion, eleven million, three hundred twenty-one thousand, one hundred thirty-one".