20212123 has 4 divisors (see below), whose sum is σ = 20221120. Its totient is φ = 20203128.

The previous prime is 20212117. The next prime is 20212151. The reversal of 20212123 is 32121202.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20212123 - 2¹⁷ = 20081051 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (20212103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2038 + ... + 6676.

It is an arithmetic number, because the mean of its divisors is an integer number (5055280).

Almost surely, 2^20212123 is an apocalyptic number.

20212123 is a deficient number, since it is larger than the sum of its proper divisors (8997).

20212123 is an equidigital number, since it uses as much as digits as its factorization.

20212123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8996.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 20212123 is about 4495.7894746084. The cubic root of 20212123 is about 272.3980394574.

Adding to 20212123 its reverse (32121202), we get a palindrome (52333325).

The spelling of 20212123 in words is "twenty million, two hundred twelve thousand, one hundred twenty-three".