212120202021 has 128 divisors (see below), whose sum is σ = 382508851200. Its totient is φ = 101437608960.

The previous prime is 212120202013. The next prime is 212120202023. The reversal of 212120202021 is 120202021212.

212120202021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 212120202021 - 2³ = 212120202013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212120202023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 11698000 + ... + 11716118.

It is an arithmetic number, because the mean of its divisors is an integer number (2988350400).

Almost surely, 2^212120202021 is an apocalyptic number.

212120202021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

212120202021 is a deficient number, since it is larger than the sum of its proper divisors (170388649179).

212120202021 is a wasteful number, since it uses less digits than its factorization.

212120202021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18259.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 212120202021 its reverse (120202021212), we get a palindrome (332322223233).

It can be divided in two parts, 212 and 120202021, that multiplied together give a palindrome (25482828452).

The spelling of 212120202021 in words is "two hundred twelve billion, one hundred twenty million, two hundred two thousand, twenty-one".