210221200021 has 8 divisors (see below), whose sum is σ = 240485837184. Its totient is φ = 180014822160.

The previous prime is 210221200003. The next prime is 210221200039. The reversal of 210221200021 is 120002122012.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (210221200003) and next prime (210221200039).

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 210221200021 - 2⁷ = 210221199893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210221199974 and 210221200010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210221200001) 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, 14557090 + ... + 14571523.

It is an arithmetic number, because the mean of its divisors is an integer number (30060729648).

Almost surely, 2^210221200021 is an apocalyptic number.

It is an amenable number.

210221200021 is a deficient number, since it is larger than the sum of its proper divisors (30264637163).

210221200021 is a wasteful number, since it uses less digits than its factorization.

210221200021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29129651.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 210221200021 its reverse (120002122012), we get a palindrome (330223322033).

The spelling of 210221200021 in words is "two hundred ten billion, two hundred twenty-one million, two hundred thousand, twenty-one".