2021210122121 has 4 divisors (see below), whose sum is σ = 2021632708992. Its totient is φ = 2020787535252.

The previous prime is 2021210122117. The next prime is 2021210122181. The reversal of 2021210122121 is 1212210121202.

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 2021210122121 - 2² = 2021210122117 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2021210122121.

It is not an unprimeable number, because it can be changed into a prime (2021210122181) 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, 211286261 + ... + 211295826.

It is an arithmetic number, because the mean of its divisors is an integer number (505408177248).

Almost surely, 2^{2021210122121} is an apocalyptic number.

It is an amenable number.

2021210122121 is a deficient number, since it is larger than the sum of its proper divisors (422586871).

2021210122121 is an equidigital number, since it uses as much as digits as its factorization.

2021210122121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422586870.

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

Adding to 2021210122121 its reverse (1212210121202), we get a palindrome (3233420243323).

The spelling of 2021210122121 in words is "two trillion, twenty-one billion, two hundred ten million, one hundred twenty-two thousand, one hundred twenty-one".