620333424405221 has 4 divisors (see below), whose sum is σ = 626475339498444. Its totient is φ = 614191509312000.

The previous prime is 620333424405173. The next prime is 620333424405241. The reversal of 620333424405221 is 122504424333026.

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 337020937096900 + 283312487308321 = 18358130^2 + 16831889^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-620333424405221 is a prime.

It is a super-2 number, since 2×620333424405221² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (620333424405241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3070957546460 + ... + 3070957546661.

It is an arithmetic number, because the mean of its divisors is an integer number (156618834874611).

Almost surely, 2^{620333424405221} is an apocalyptic number.

It is an amenable number.

620333424405221 is a deficient number, since it is larger than the sum of its proper divisors (6141915093223).

620333424405221 is a wasteful number, since it uses less digits than its factorization.

620333424405221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6141915093222.

The product of its (nonzero) digits is 829440, while the sum is 41.

Adding to 620333424405221 its reverse (122504424333026), we get a palindrome (742837848738247).

The spelling of 620333424405221 in words is "six hundred twenty trillion, three hundred thirty-three billion, four hundred twenty-four million, four hundred five thousand, two hundred twenty-one".