21131200011 has 16 divisors (see below), whose sum is σ = 28713286944. Its totient is φ = 13818415104.

The previous prime is 21131199997. The next prime is 21131200061. The reversal of 21131200011 is 11000213112.

It is not a de Polignac number, because 21131200011 - 2¹¹ = 21131197963 is a prime.

It is a super-2 number, since 2×21131200011² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21131200011.

It is not an unprimeable number, because it can be changed into a prime (21131200061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 794155 + ... + 820331.

It is an arithmetic number, because the mean of its divisors is an integer number (1794580434).

Almost surely, 2^21131200011 is an apocalyptic number.

21131200011 is a deficient number, since it is larger than the sum of its proper divisors (7582086933).

21131200011 is a wasteful number, since it uses less digits than its factorization.

21131200011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31310.

The product of its (nonzero) digits is 12, while the sum is 12.

Adding to 21131200011 its reverse (11000213112), we get a palindrome (32131413123).

The spelling of 21131200011 in words is "twenty-one billion, one hundred thirty-one million, two hundred thousand, eleven".