221020420322 has 24 divisors (see below), whose sum is σ = 359029005156. Its totient is φ = 101999678976.

The previous prime is 221020420307. The next prime is 221020420367. The reversal of 221020420322 is 223024020122.

It can be written as a sum of positive squares in 6 ways, for example, as 3436421641 + 217583998681 = 58621^2 + 466459^2 .

It is a junction number, because it is equal to n+sod(n) for n = 221020420294 and 221020420303.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4469798 + ... + 4518974.

Almost surely, 2^221020420322 is an apocalyptic number.

221020420322 is a deficient number, since it is larger than the sum of its proper divisors (138008584834).

221020420322 is a wasteful number, since it uses less digits than its factorization.

221020420322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62502 (or 62489 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 221020420322 its reverse (223024020122), we get a palindrome (444044440444).

The spelling of 221020420322 in words is "two hundred twenty-one billion, twenty million, four hundred twenty thousand, three hundred twenty-two".