21131000000011 has 4 divisors (see below), whose sum is σ = 23052000000024. Its totient is φ = 19210000000000.

The previous prime is 21130999999997. The next prime is 21131000000039. The reversal of 21131000000011 is 11000000013112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21131000000011 - 2⁵ = 21130999999979 is a prime.

It is a super-2 number, since 2×21131000000011² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21131000000111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 960499999990 + ... + 960500000011.

It is an arithmetic number, because the mean of its divisors is an integer number (5763000000006).

Almost surely, 2^{21131000000011} is an apocalyptic number.

21131000000011 is a deficient number, since it is larger than the sum of its proper divisors (1921000000013).

21131000000011 is a wasteful number, since it uses less digits than its factorization.

21131000000011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1921000000012.

The product of its (nonzero) digits is 6, while the sum is 10.

Adding to 21131000000011 its reverse (11000000013112), we get a palindrome (32131000013123).

The spelling of 21131000000011 in words is "twenty-one trillion, one hundred thirty-one billion, eleven", and thus it is an aban number.