2021011220121 has 4 divisors (see below), whose sum is σ = 2694681626832. Its totient is φ = 1347340813412.

The previous prime is 2021011220071. The next prime is 2021011220141. The reversal of 2021011220121 is 1210221101202.

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 2021011220121 - 2⁶ = 2021011220057 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2021011220121.

It is not an unprimeable number, because it can be changed into a prime (2021011220141) 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, 336835203351 + ... + 336835203356.

It is an arithmetic number, because the mean of its divisors is an integer number (673670406708).

Almost surely, 2^{2021011220121} is an apocalyptic number.

It is an amenable number.

2021011220121 is a deficient number, since it is larger than the sum of its proper divisors (673670406711).

2021011220121 is an equidigital number, since it uses as much as digits as its factorization.

2021011220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 673670406710.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 2021011220121 its reverse (1210221101202), we get a palindrome (3231232321323).

The spelling of 2021011220121 in words is "two trillion, twenty-one billion, eleven million, two hundred twenty thousand, one hundred twenty-one".