21120220200221 has 8 divisors (see below), whose sum is σ = 21175330449024. Its totient is φ = 21065138227360.

The previous prime is 21120220200217. The next prime is 21120220200271. The reversal of 21120220200221 is 12200202202112.

It is a happy number.

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 21120220200221 - 2² = 21120220200217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21120220200221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120220200271) 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, 5572760 + ... + 8561313.

It is an arithmetic number, because the mean of its divisors is an integer number (2646916306128).

Almost surely, 2^{21120220200221} is an apocalyptic number.

It is an amenable number.

21120220200221 is a deficient number, since it is larger than the sum of its proper divisors (55110248803).

21120220200221 is a wasteful number, since it uses less digits than its factorization.

21120220200221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14137971.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21120220200221 its reverse (12200202202112), we get a palindrome (33320422402333).

The spelling of 21120220200221 in words is "twenty-one trillion, one hundred twenty billion, two hundred twenty million, two hundred thousand, two hundred twenty-one".