2021021220123 has 12 divisors (see below), whose sum is σ = 2919291074128. Its totient is φ = 1347329849040.

The previous prime is 2021021220107. The next prime is 2021021220161. The reversal of 2021021220123 is 3210221201202.

2021021220123 is a `hidden beast` number, since 20 + 210 + 212 + 201 + 23 = 666.

It is not a de Polignac number, because 2021021220123 - 2⁴ = 2021021220107 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2021021220096 and 2021021220105.

It is not an unprimeable number, because it can be changed into a prime (2021021221123) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 723343 + ... + 2136648.

Almost surely, 2^{2021021220123} is an apocalyptic number.

2021021220123 is a deficient number, since it is larger than the sum of its proper divisors (898269854005).

2021021220123 is a wasteful number, since it uses less digits than its factorization.

2021021220123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2938514 (or 2938511 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 2021021220123 its reverse (3210221201202), we get a palindrome (5231242421325).

The spelling of 2021021220123 in words is "two trillion, twenty-one billion, twenty-one million, two hundred twenty thousand, one hundred twenty-three".