21130123101221 has 8 divisors (see below), whose sum is σ = 21189596500800. Its totient is φ = 21070653119680.

The previous prime is 21130123101193. The next prime is 21130123101293. The reversal of 21130123101221 is 12210132103112.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21130123101221 is a prime.

It is a super-2 number, since 2×21130123101221² (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 = 21130123101193 and 21130123101202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21130123104221) 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, 11789645 + ... + 13463133.

It is an arithmetic number, because the mean of its divisors is an integer number (2648699562600).

Almost surely, 2^{21130123101221} is an apocalyptic number.

It is an amenable number.

21130123101221 is a deficient number, since it is larger than the sum of its proper divisors (59473399579).

21130123101221 is a wasteful number, since it uses less digits than its factorization.

21130123101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1709019.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 21130123101221 its reverse (12210132103112), we get a palindrome (33340255204333).

The spelling of 21130123101221 in words is "twenty-one trillion, one hundred thirty billion, one hundred twenty-three million, one hundred one thousand, two hundred twenty-one".