21220200221 has 8 divisors (see below), whose sum is σ = 23151549600. Its totient is φ = 19289224240.

The previous prime is 21220200193. The next prime is 21220200263. The reversal of 21220200221 is 12200202212.

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

It is not a de Polignac number, because 21220200221 - 2¹⁴ = 21220183837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21220200196 and 21220200205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222200221) 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, 32915 + ... + 208623.

It is an arithmetic number, because the mean of its divisors is an integer number (2893943700).

Almost surely, 2^21220200221 is an apocalyptic number.

It is an amenable number.

21220200221 is a deficient number, since it is larger than the sum of its proper divisors (1931349379).

21220200221 is a wasteful number, since it uses less digits than its factorization.

21220200221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186699.

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

Adding to 21220200221 its reverse (12200202212), we get a palindrome (33420402433).

The spelling of 21220200221 in words is "twenty-one billion, two hundred twenty million, two hundred thousand, two hundred twenty-one".