21001231222013 has 8 divisors (see below), whose sum is σ = 24001480040832. Its totient is φ = 18001000635696.

The previous prime is 21001231222003. The next prime is 21001231222033. The reversal of 21001231222013 is 31022213210012.

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 21001231222013 - 2¹⁰ = 21001231220989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001231222003) 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, 1993670 + ... + 6780647.

It is an arithmetic number, because the mean of its divisors is an integer number (3000185005104).

Almost surely, 2^{21001231222013} is an apocalyptic number.

It is an amenable number.

21001231222013 is a deficient number, since it is larger than the sum of its proper divisors (3000248818819).

21001231222013 is an equidigital number, since it uses as much as digits as its factorization.

21001231222013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9116251.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 21001231222013 its reverse (31022213210012), we get a palindrome (52023444432025).

The spelling of 21001231222013 in words is "twenty-one trillion, one billion, two hundred thirty-one million, two hundred twenty-two thousand, thirteen".