221220200021 has 8 divisors (see below), whose sum is σ = 222734966400. Its totient is φ = 219705834832.

The previous prime is 221220200017. The next prime is 221220200023. The reversal of 221220200021 is 120002022122.

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 221220200021 - 2² = 221220200017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221220199969 and 221220200005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221220200023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1051376 + ... + 1244118.

It is an arithmetic number, because the mean of its divisors is an integer number (27841870800).

Almost surely, 2^221220200021 is an apocalyptic number.

It is an amenable number.

221220200021 is a deficient number, since it is larger than the sum of its proper divisors (1514766379).

221220200021 is a wasteful number, since it uses less digits than its factorization.

221220200021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200595.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 221220200021 its reverse (120002022122), we get a palindrome (341222222143).

The spelling of 221220200021 in words is "two hundred twenty-one billion, two hundred twenty million, two hundred thousand, twenty-one".