21311020011 has 32 divisors (see below), whose sum is σ = 30050611200. Its totient is φ = 13413720320.

The previous prime is 21311019997. The next prime is 21311020039. The reversal of 21311020011 is 11002011312.

It is not a de Polignac number, because 21311020011 - 2¹¹ = 21311017963 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21311020061) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 969535 + ... + 991271.

It is an arithmetic number, because the mean of its divisors is an integer number (939081600).

Almost surely, 2^21311020011 is an apocalyptic number.

21311020011 is a deficient number, since it is larger than the sum of its proper divisors (8739591189).

21311020011 is a wasteful number, since it uses less digits than its factorization.

21311020011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22019.

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

Adding to 21311020011 its reverse (11002011312), we get a palindrome (32313031323).

The spelling of 21311020011 in words is "twenty-one billion, three hundred eleven million, twenty thousand, eleven".