21220121002013 has 8 divisors (see below), whose sum is σ = 21911557662720. Its totient is φ = 20529116630640.

The previous prime is 21220121002009. The next prime is 21220121002019. The reversal of 21220121002013 is 31020012102212.

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 21220121002013 - 2² = 21220121002009 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21220121001982 and 21220121002000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220121002019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 107972558 + ... + 108168911.

It is an arithmetic number, because the mean of its divisors is an integer number (2738944707840).

Almost surely, 2^{21220121002013} is an apocalyptic number.

It is an amenable number.

21220121002013 is a deficient number, since it is larger than the sum of its proper divisors (691436660707).

21220121002013 is a wasteful number, since it uses less digits than its factorization.

21220121002013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216144667.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21220121002013 its reverse (31020012102212), we get a palindrome (52240133104225).

The spelling of 21220121002013 in words is "twenty-one trillion, two hundred twenty billion, one hundred twenty-one million, two thousand, thirteen".