620221656221 has 8 divisors (see below), whose sum is σ = 641188156224. Its totient is φ = 599552553600.

The previous prime is 620221656209. The next prime is 620221656233. The reversal of 620221656221 is 122656122026.

It is an interprime number because it is at equal distance from previous prime (620221656209) and next prime (620221656233).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 620221656221 - 2¹⁰ = 620221655197 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 (620221656251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74345105 + ... + 74353446.

It is an arithmetic number, because the mean of its divisors is an integer number (80148519528).

Almost surely, 2^620221656221 is an apocalyptic number.

It is an amenable number.

620221656221 is a deficient number, since it is larger than the sum of its proper divisors (20966500003).

620221656221 is a wasteful number, since it uses less digits than its factorization.

620221656221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148698691.

The product of its (nonzero) digits is 34560, while the sum is 35.

Adding to 620221656221 its reverse (122656122026), we get a palindrome (742877778247).

The spelling of 620221656221 in words is "six hundred twenty billion, two hundred twenty-one million, six hundred fifty-six thousand, two hundred twenty-one".