212100220123 has 8 divisors (see below), whose sum is σ = 241442148096. Its totient is φ = 184434973800.

The previous prime is 212100220121. The next prime is 212100220133. The reversal of 212100220123 is 321022001212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 212100220123 - 2¹ = 212100220121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212100220097 and 212100220106.

It is not an unprimeable number, because it can be changed into a prime (212100220121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 419170143 + ... + 419170648.

It is an arithmetic number, because the mean of its divisors is an integer number (30180268512).

Almost surely, 2^212100220123 is an apocalyptic number.

212100220123 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

212100220123 is a deficient number, since it is larger than the sum of its proper divisors (29341927973).

212100220123 is a wasteful number, since it uses less digits than its factorization.

212100220123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 838340825.

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

Adding to 212100220123 its reverse (321022001212), we get a palindrome (533122221335).

Subtracting 212100220123 from its reverse (321022001212), we obtain a square (108921781089 = 330033²).

The spelling of 212100220123 in words is "two hundred twelve billion, one hundred million, two hundred twenty thousand, one hundred twenty-three".