21131330011 has 16 divisors (see below), whose sum is σ = 23482636128. Its totient is φ = 19012139520.

The previous prime is 21131329993. The next prime is 21131330029. The reversal of 21131330011 is 11003313112.

It is an interprime number because it is at equal distance from previous prime (21131329993) and next prime (21131330029).

It is not a de Polignac number, because 21131330011 - 2¹³ = 21131321819 is a prime.

It is a super-3 number, since 3×21131330011³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21131330041) 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, 47271 + ... + 210943.

It is an arithmetic number, because the mean of its divisors is an integer number (1467664758).

Almost surely, 2^21131330011 is an apocalyptic number.

21131330011 is a deficient number, since it is larger than the sum of its proper divisors (2351306117).

21131330011 is an equidigital number, since it uses as much as digits as its factorization.

21131330011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163803 (or 163781 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 16.

Adding to 21131330011 its reverse (11003313112), we get a palindrome (32134643123).

The spelling of 21131330011 in words is "twenty-one billion, one hundred thirty-one million, three hundred thirty thousand, eleven".