2021021220121 has 8 divisors (see below), whose sum is σ = 2029153327488. Its totient is φ = 2012889750000.

The previous prime is 2021021220107. The next prime is 2021021220161. The reversal of 2021021220121 is 1210221201202.

It is a happy number.

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 2021021220121 - 2²⁹ = 2020484349209 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2021021220095 and 2021021220104.

It is not an unprimeable number, because it can be changed into a prime (2021021220161) 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, 6807616 + ... + 7098286.

It is an arithmetic number, because the mean of its divisors is an integer number (253644165936).

Almost surely, 2^{2021021220121} is an apocalyptic number.

It is an amenable number.

2021021220121 is a deficient number, since it is larger than the sum of its proper divisors (8132107367).

2021021220121 is a wasteful number, since it uses less digits than its factorization.

2021021220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318623.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 2021021220121 its reverse (1210221201202), we get a palindrome (3231242421323).

The spelling of 2021021220121 in words is "two trillion, twenty-one billion, twenty-one million, two hundred twenty thousand, one hundred twenty-one".