2122121021021 has 4 divisors (see below), whose sum is σ = 2122128457152. Its totient is φ = 2122113584892.

The previous prime is 2122121021011. The next prime is 2122121021039. The reversal of 2122121021021 is 1201201212212.

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 2122121021021 - 2¹⁴ = 2122121004637 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2122121021011) 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 3 ways as a sum of consecutive naturals, for example, 3272171 + ... + 3866696.

It is an arithmetic number, because the mean of its divisors is an integer number (530532114288).

Almost surely, 2^{2122121021021} is an apocalyptic number.

It is an amenable number.

2122121021021 is a deficient number, since it is larger than the sum of its proper divisors (7436131).

2122121021021 is an equidigital number, since it uses as much as digits as its factorization.

2122121021021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7436130.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 2122121021021 its reverse (1201201212212), we get a palindrome (3323322233233).

The spelling of 2122121021021 in words is "two trillion, one hundred twenty-two billion, one hundred twenty-one million, twenty-one thousand, twenty-one".