612220616221 has 4 divisors (see below), whose sum is σ = 613602604512. Its totient is φ = 610838627932.

The previous prime is 612220616213. The next prime is 612220616233. The reversal of 612220616221 is 122616022216.

612220616221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 612220616221 - 2³ = 612220616213 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 (612220616621) 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, 690993481 + ... + 690994366.

It is an arithmetic number, because the mean of its divisors is an integer number (153400651128).

Almost surely, 2^612220616221 is an apocalyptic number.

It is an amenable number.

612220616221 is a deficient number, since it is larger than the sum of its proper divisors (1381988291).

612220616221 is a wasteful number, since it uses less digits than its factorization.

612220616221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1381988290.

The product of its (nonzero) digits is 6912, while the sum is 31.

Adding to 612220616221 its reverse (122616022216), we get a palindrome (734836638437).

The spelling of 612220616221 in words is "six hundred twelve billion, two hundred twenty million, six hundred sixteen thousand, two hundred twenty-one".