21013231123011 has 8 divisors (see below), whose sum is σ = 28017683697664. Its totient is φ = 14008799648520.

The previous prime is 21013231123009. The next prime is 21013231123039. The reversal of 21013231123011 is 11032113231012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21013231123011 - 2¹ = 21013231123009 is a prime.

It is a super-2 number, since 2×21013231123011² (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 (21013231122011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2783155 + ... + 7054956.

It is an arithmetic number, because the mean of its divisors is an integer number (3502210462208).

Almost surely, 2^{21013231123011} is an apocalyptic number.

21013231123011 is a deficient number, since it is larger than the sum of its proper divisors (7004452574653).

21013231123011 is an equidigital number, since it uses as much as digits as its factorization.

21013231123011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10550081.

The product of its (nonzero) digits is 216, while the sum is 21.

Adding to 21013231123011 its reverse (11032113231012), we get a palindrome (32045344354023).

The spelling of 21013231123011 in words is "twenty-one trillion, thirteen billion, two hundred thirty-one million, one hundred twenty-three thousand, eleven".