212021020123 has 4 divisors (see below), whose sum is σ = 231295658328. Its totient is φ = 192746381920.

The previous prime is 212021020093. The next prime is 212021020147. The reversal of 212021020123 is 321020120212.

It is a happy number.

212021020123 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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-212021020123 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212021020097 and 212021020106.

It is not an unprimeable number, because it can be changed into a prime (212021024123) 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, 9637319086 + ... + 9637319107.

It is an arithmetic number, because the mean of its divisors is an integer number (57823914582).

Almost surely, 2^212021020123 is an apocalyptic number.

212021020123 is a deficient number, since it is larger than the sum of its proper divisors (19274638205).

212021020123 is a wasteful number, since it uses less digits than its factorization.

212021020123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19274638204.

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

Adding to 212021020123 its reverse (321020120212), we get a palindrome (533041140335).

The spelling of 212021020123 in words is "two hundred twelve billion, twenty-one million, twenty thousand, one hundred twenty-three".