212140303021 has 4 divisors (see below), whose sum is σ = 212208278044. Its totient is φ = 212072328000.

The previous prime is 212140303007. The next prime is 212140303057. The reversal of 212140303021 is 120303041212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1096536996 + 211043766025 = 33114^2 + 459395^2 .

It is a cyclic number.

It is not a de Polignac number, because 212140303021 - 2¹³ = 212140294829 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212140303021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212140303061) 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, 33982830 + ... + 33989071.

It is an arithmetic number, because the mean of its divisors is an integer number (53052069511).

Almost surely, 2^212140303021 is an apocalyptic number.

It is an amenable number.

212140303021 is a deficient number, since it is larger than the sum of its proper divisors (67975023).

212140303021 is an equidigital number, since it uses as much as digits as its factorization.

212140303021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67975022.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 212140303021 its reverse (120303041212), we get a palindrome (332443344233).

The spelling of 212140303021 in words is "two hundred twelve billion, one hundred forty million, three hundred three thousand, twenty-one".