20210312123 has 4 divisors (see below), whose sum is σ = 20321971488. Its totient is φ = 20098652760.

The previous prime is 20210312107. The next prime is 20210312159. The reversal of 20210312123 is 32121301202.

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

It is a cyclic number.

It is not a de Polignac number, because 20210312123 - 2⁴ = 20210312107 is a prime.

It is a super-2 number, since 2×20210312123² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20210312723) 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, 55829411 + ... + 55829772.

It is an arithmetic number, because the mean of its divisors is an integer number (5080492872).

Almost surely, 2^20210312123 is an apocalyptic number.

20210312123 is a deficient number, since it is larger than the sum of its proper divisors (111659365).

20210312123 is a wasteful number, since it uses less digits than its factorization.

20210312123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111659364.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 20210312123 its reverse (32121301202), we get a palindrome (52331613325).

The spelling of 20210312123 in words is "twenty billion, two hundred ten million, three hundred twelve thousand, one hundred twenty-three".