2113123221221 has 8 divisors (see below), whose sum is σ = 2153072716704. Its totient is φ = 2073176660880.

The previous prime is 2113123221127. The next prime is 2113123221241. The reversal of 2113123221221 is 1221223213112.

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-2113123221221 is a prime.

It is a super-5 number, since 5×2113123221221⁵ (a number of 63 digits) contains 55555 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2113123221241) 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, 747710 + ... + 2187536.

It is an arithmetic number, because the mean of its divisors is an integer number (269134089588).

Almost surely, 2^{2113123221221} is an apocalyptic number.

It is an amenable number.

2113123221221 is a deficient number, since it is larger than the sum of its proper divisors (39949495483).

2113123221221 is a wasteful number, since it uses less digits than its factorization.

2113123221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1467571.

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

Adding to 2113123221221 its reverse (1221223213112), we get a palindrome (3334346434333).

The spelling of 2113123221221 in words is "two trillion, one hundred thirteen billion, one hundred twenty-three million, two hundred twenty-one thousand, two hundred twenty-one".