2021320342121 has 4 divisors (see below), whose sum is σ = 2021460716244. Its totient is φ = 2021179968000.

The previous prime is 2021320342117. The next prime is 2021320342157. The reversal of 2021320342121 is 1212430231202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2019707114896 + 1613227225 = 1421164^2 + 40165^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021320342121 - 2² = 2021320342117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2021620342121) 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, 70165460 + ... + 70194261.

It is an arithmetic number, because the mean of its divisors is an integer number (505365179061).

Almost surely, 2^{2021320342121} is an apocalyptic number.

It is an amenable number.

2021320342121 is a deficient number, since it is larger than the sum of its proper divisors (140374123).

2021320342121 is a wasteful number, since it uses less digits than its factorization.

2021320342121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140374122.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 2021320342121 its reverse (1212430231202), we get a palindrome (3233750573323).

The spelling of 2021320342121 in words is "two trillion, twenty-one billion, three hundred twenty million, three hundred forty-two thousand, one hundred twenty-one".