212121023543 has 96 divisors (see below), whose sum is σ = 268703023680. Its totient is φ = 165032017920.

The previous prime is 212121023519. The next prime is 212121023561. The reversal of 212121023543 is 345320121212.

It is not a de Polignac number, because 212121023543 - 2⁸ = 212121023287 is a prime.

It is a super-3 number, since 3×212121023543³ (a number of 35 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212121023563) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 629439071 + ... + 629439407.

It is an arithmetic number, because the mean of its divisors is an integer number (2798989830).

Almost surely, 2^212121023543 is an apocalyptic number.

212121023543 is a deficient number, since it is larger than the sum of its proper divisors (56582000137).

212121023543 is a wasteful number, since it uses less digits than its factorization.

212121023543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 625 (or 606 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

Adding to 212121023543 its reverse (345320121212), we get a palindrome (557441144755).

The spelling of 212121023543 in words is "two hundred twelve billion, one hundred twenty-one million, twenty-three thousand, five hundred forty-three".