2121013311221 has 8 divisors (see below), whose sum is σ = 2483137535424. Its totient is φ = 1773669667680.

The previous prime is 2121013311167. The next prime is 2121013311227. The reversal of 2121013311221 is 1221133101212.

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 2121013311221 - 2¹⁴ = 2121013294837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2121013311193 and 2121013311202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121013311227) 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, 3695144855 + ... + 3695145428.

It is an arithmetic number, because the mean of its divisors is an integer number (310392191928).

Almost surely, 2^{2121013311221} is an apocalyptic number.

It is an amenable number.

2121013311221 is a deficient number, since it is larger than the sum of its proper divisors (362124224203).

2121013311221 is an equidigital number, since it uses as much as digits as its factorization.

2121013311221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7390290331.

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

Adding to 2121013311221 its reverse (1221133101212), we get a palindrome (3342146412433).

The spelling of 2121013311221 in words is "two trillion, one hundred twenty-one billion, thirteen million, three hundred eleven thousand, two hundred twenty-one".