2021103123 has 32 divisors (see below), whose sum is σ = 3076416000. Its totient is φ = 1169220096.

The previous prime is 2021103107. The next prime is 2021103137. The reversal of 2021103123 is 3213011202.

It is not a de Polignac number, because 2021103123 - 2⁴ = 2021103107 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2021103143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 926448 + ... + 928626.

It is an arithmetic number, because the mean of its divisors is an integer number (96138000).

Almost surely, 2^2021103123 is an apocalyptic number.

2021103123 is a deficient number, since it is larger than the sum of its proper divisors (1055312877).

2021103123 is a wasteful number, since it uses less digits than its factorization.

2021103123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3611.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 2021103123 is about 44956.6805158032. The cubic root of 2021103123 is about 1264.3369327832.

Adding to 2021103123 its reverse (3213011202), we get a palindrome (5234114325).

The spelling of 2021103123 in words is "two billion, twenty-one million, one hundred three thousand, one hundred twenty-three".