612252635221 has 4 divisors (see below), whose sum is σ = 612732082572. Its totient is φ = 611773187872.

The previous prime is 612252635219. The next prime is 612252635251. The reversal of 612252635221 is 122536252216.

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 271038936996 + 341213698225 = 520614^2 + 584135^2 .

It is a cyclic number.

It is not a de Polignac number, because 612252635221 - 2¹ = 612252635219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (612252635251) 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, 239721760 + ... + 239724313.

It is an arithmetic number, because the mean of its divisors is an integer number (153183020643).

Almost surely, 2^612252635221 is an apocalyptic number.

It is an amenable number.

612252635221 is a deficient number, since it is larger than the sum of its proper divisors (479447351).

612252635221 is a wasteful number, since it uses less digits than its factorization.

612252635221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479447350.

The product of its digits is 86400, while the sum is 37.

Adding to 612252635221 its reverse (122536252216), we get a palindrome (734788887437).

The spelling of 612252635221 in words is "six hundred twelve billion, two hundred fifty-two million, six hundred thirty-five thousand, two hundred twenty-one".