2021002020121 has 4 divisors (see below), whose sum is σ = 2309716594432. Its totient is φ = 1732287445812.

The previous prime is 2021002020109. The next prime is 2021002020137. The reversal of 2021002020121 is 1210202001202.

It is a happy number.

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 not a de Polignac number, because 2021002020121 - 2¹⁹ = 2021001495833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2021002020101) 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, 144357287145 + ... + 144357287158.

It is an arithmetic number, because the mean of its divisors is an integer number (577429148608).

Almost surely, 2^{2021002020121} is an apocalyptic number.

It is an amenable number.

2021002020121 is a deficient number, since it is larger than the sum of its proper divisors (288714574311).

2021002020121 is an equidigital number, since it uses as much as digits as its factorization.

2021002020121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288714574310.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 2021002020121 its reverse (1210202001202), we get a palindrome (3231204021323).

The spelling of 2021002020121 in words is "two trillion, twenty-one billion, two million, twenty thousand, one hundred twenty-one".