212121100023 has 16 divisors (see below), whose sum is σ = 323373931776. Its totient is φ = 121158889920.

The previous prime is 212121100021. The next prime is 212121100027. The reversal of 212121100023 is 320001121212.

It is not a de Polignac number, because 212121100023 - 2¹ = 212121100021 is a prime.

It is a super-3 number, since 3×212121100023³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 212121099975 and 212121100011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212121100021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2166261 + ... + 2262062.

It is an arithmetic number, because the mean of its divisors is an integer number (20210870736).

Almost surely, 2^212121100023 is an apocalyptic number.

212121100023 is a deficient number, since it is larger than the sum of its proper divisors (111252831753).

212121100023 is a wasteful number, since it uses less digits than its factorization.

212121100023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4430614.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 212121100023 its reverse (320001121212), we get a palindrome (532122221235).

The spelling of 212121100023 in words is "two hundred twelve billion, one hundred twenty-one million, one hundred thousand, twenty-three".