21001313011 has 16 divisors (see below), whose sum is σ = 24702865920. Its totient is φ = 17482671360.

The previous prime is 21001312931. The next prime is 21001313033. The reversal of 21001313011 is 11031310012.

It is not a de Polignac number, because 21001313011 - 2²⁹ = 20464442099 is a prime.

It is a super-2 number, since 2×21001313011² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21001312982 and 21001313000.

It is not an unprimeable number, because it can be changed into a prime (21001313051) 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, 282046 + ... + 348643.

It is an arithmetic number, because the mean of its divisors is an integer number (1543929120).

Almost surely, 2^21001313011 is an apocalyptic number.

21001313011 is a deficient number, since it is larger than the sum of its proper divisors (3701552909).

21001313011 is an equidigital number, since it uses as much as digits as its factorization.

21001313011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 630834.

The product of its (nonzero) digits is 18, while the sum is 13.

Adding to 21001313011 its reverse (11031310012), we get a palindrome (32032623023).

The spelling of 21001313011 in words is "twenty-one billion, one million, three hundred thirteen thousand, eleven".