212345414581 has 2 divisors, whose sum is σ = 212345414582. Its totient is φ = 212345414580.

The previous prime is 212345414551. The next prime is 212345414591. The reversal of 212345414581 is 185414543212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 127003140625 + 85342273956 = 356375^2 + 292134^2 .

It is a cyclic number.

It is not a de Polignac number, because 212345414581 - 2¹⁷ = 212345283509 is a prime.

It is a super-2 number, since 2×212345414581² (a number of 23 digits) contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212345414551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106172707290 + 106172707291.

It is an arithmetic number, because the mean of its divisors is an integer number (106172707291).

Almost surely, 2^212345414581 is an apocalyptic number.

It is an amenable number.

212345414581 is a deficient number, since it is larger than the sum of its proper divisors (1).

212345414581 is an equidigital number, since it uses as much as digits as its factorization.

212345414581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 153600, while the sum is 40.

Adding to 212345414581 its reverse (185414543212), we get a palindrome (397759957793).

The spelling of 212345414581 in words is "two hundred twelve billion, three hundred forty-five million, four hundred fourteen thousand, five hundred eighty-one".