21120021200221 has 8 divisors (see below), whose sum is σ = 21376784571840. Its totient is φ = 20864357458368.

The previous prime is 21120021200209. The next prime is 21120021200231. The reversal of 21120021200221 is 12200212002112.

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 21120021200221 - 2⁵ = 21120021200189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21120021200195 and 21120021200204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120021200231) 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, 274868796 + ... + 274945621.

It is an arithmetic number, because the mean of its divisors is an integer number (2672098071480).

Almost surely, 2^{21120021200221} is an apocalyptic number.

It is an amenable number.

21120021200221 is a deficient number, since it is larger than the sum of its proper divisors (256763371619).

21120021200221 is a wasteful number, since it uses less digits than its factorization.

21120021200221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549814883.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21120021200221 its reverse (12200212002112), we get a palindrome (33320233202333).

The spelling of 21120021200221 in words is "twenty-one trillion, one hundred twenty billion, twenty-one million, two hundred thousand, two hundred twenty-one".