212040340453 has 2 divisors, whose sum is σ = 212040340454. Its totient is φ = 212040340452.

The previous prime is 212040340439. The next prime is 212040340471. The reversal of 212040340453 is 354043040212.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 202889887489 + 9150452964 = 450433^2 + 95658^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212040340453 is a prime.

It is a super-2 number, since 2×212040340453² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212040349453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106020170226 + 106020170227.

It is an arithmetic number, because the mean of its divisors is an integer number (106020170227).

Almost surely, 2^212040340453 is an apocalyptic number.

It is an amenable number.

212040340453 is a deficient number, since it is larger than the sum of its proper divisors (1).

212040340453 is an equidigital number, since it uses as much as digits as its factorization.

212040340453 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11520, while the sum is 28.

Adding to 212040340453 its reverse (354043040212), we get a palindrome (566083380665).

The spelling of 212040340453 in words is "two hundred twelve billion, forty million, three hundred forty thousand, four hundred fifty-three".