2021020021123 has 4 divisors (see below), whose sum is σ = 2108890456848. Its totient is φ = 1933149585400.

The previous prime is 2021020021087. The next prime is 2021020021151. The reversal of 2021020021123 is 3211200201202.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2021020021123 is a prime.

It is a super-2 number, since 2×2021020021123² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2021020021097 and 2021020021106.

It is not an unprimeable number, because it can be changed into a prime (2021020021183) 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, 43935217828 + ... + 43935217873.

It is an arithmetic number, because the mean of its divisors is an integer number (527222614212).

Almost surely, 2^{2021020021123} is an apocalyptic number.

2021020021123 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

2021020021123 is a deficient number, since it is larger than the sum of its proper divisors (87870435725).

2021020021123 is an equidigital number, since it uses as much as digits as its factorization.

2021020021123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87870435724.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 2021020021123 its reverse (3211200201202), we get a palindrome (5232220222325).

The spelling of 2021020021123 in words is "two trillion, twenty-one billion, twenty million, twenty-one thousand, one hundred twenty-three".