21001404113231 has 8 divisors (see below), whose sum is σ = 22248925468704. Its totient is φ = 19755232162560.

The previous prime is 21001404113227. The next prime is 21001404113233. The reversal of 21001404113231 is 13231140410012.

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

It is a cyclic number.

It is not a de Polignac number, because 21001404113231 - 2² = 21001404113227 is a prime.

It is a super-2 number, since 2×21001404113231² (a number of 27 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 = 21001404113197 and 21001404113206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001404113233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 337319150 + ... + 337381403.

It is an arithmetic number, because the mean of its divisors is an integer number (2781115683588).

Almost surely, 2^{21001404113231} is an apocalyptic number.

21001404113231 is a deficient number, since it is larger than the sum of its proper divisors (1247521355473).

21001404113231 is a wasteful number, since it uses less digits than its factorization.

21001404113231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 674702401.

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 21001404113231 its reverse (13231140410012), we get a palindrome (34232544523243).

The spelling of 21001404113231 in words is "twenty-one trillion, one billion, four hundred four million, one hundred thirteen thousand, two hundred thirty-one".