2021210221123 has 4 divisors (see below), whose sum is σ = 2029596985768. Its totient is φ = 2012823456480.

The previous prime is 2021210221091. The next prime is 2021210221159. The reversal of 2021210221123 is 3211220121202.

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

It is a cyclic number.

It is not a de Polignac number, because 2021210221123 - 2⁵ = 2021210221091 is a prime.

It is a super-2 number, since 2×2021210221123² (a number of 25 digits) contains 22 as substring.

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 2021210221123.

It is not an unprimeable number, because it can be changed into a prime (2021210221183) 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, 4193381961 + ... + 4193382442.

It is an arithmetic number, because the mean of its divisors is an integer number (507399246442).

Almost surely, 2^{2021210221123} is an apocalyptic number.

2021210221123 is a deficient number, since it is larger than the sum of its proper divisors (8386764645).

2021210221123 is an equidigital number, since it uses as much as digits as its factorization.

2021210221123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8386764644.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 2021210221123 its reverse (3211220121202), we get a palindrome (5232430342325).

The spelling of 2021210221123 in words is "two trillion, twenty-one billion, two hundred ten million, two hundred twenty-one thousand, one hundred twenty-three".