2121442212121 has 4 divisors (see below), whose sum is σ = 2166579280512. Its totient is φ = 2076305143732.

The previous prime is 2121442212119. The next prime is 2121442212143. The reversal of 2121442212121 is 1212122441212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2121442212121 - 2¹ = 2121442212119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121442212161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22568534125 + ... + 22568534218.

It is an arithmetic number, because the mean of its divisors is an integer number (541644820128).

Almost surely, 2^{2121442212121} is an apocalyptic number.

It is an amenable number.

2121442212121 is a deficient number, since it is larger than the sum of its proper divisors (45137068391).

2121442212121 is an equidigital number, since it uses as much as digits as its factorization.

2121442212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45137068390.

The product of its digits is 1024, while the sum is 25.

Adding to 2121442212121 its reverse (1212122441212), we get a palindrome (3333564653333).

The spelling of 2121442212121 in words is "two trillion, one hundred twenty-one billion, four hundred forty-two million, two hundred twelve thousand, one hundred twenty-one".