212021110123 has 4 divisors (see below), whose sum is σ = 212043667768. Its totient is φ = 211998552480.

The previous prime is 212021110109. The next prime is 212021110129. The reversal of 212021110123 is 321011120212.

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 212021110123 - 2²¹ = 212019012971 is a prime.

It is a super-2 number, since 2×212021110123² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212021110097 and 212021110106.

It is not an unprimeable number, because it can be changed into a prime (212021110129) 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, 11264718 + ... + 11283523.

It is an arithmetic number, because the mean of its divisors is an integer number (53010916942).

Almost surely, 2^212021110123 is an apocalyptic number.

212021110123 is a deficient number, since it is larger than the sum of its proper divisors (22557645).

212021110123 is an equidigital number, since it uses as much as digits as its factorization.

212021110123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22557644.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 212021110123 its reverse (321011120212), we get a palindrome (533032230335).

The spelling of 212021110123 in words is "two hundred twelve billion, twenty-one million, one hundred ten thousand, one hundred twenty-three".