202221000021 has 16 divisors (see below), whose sum is σ = 281454846848. Its totient is φ = 129020040000.

The previous prime is 202221000017. The next prime is 202221000049. The reversal of 202221000021 is 120000122202.

It is not a de Polignac number, because 202221000021 - 2² = 202221000017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 202220999970 and 202221000006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202221000061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14926105 + ... + 14939646.

It is an arithmetic number, because the mean of its divisors is an integer number (17590927928).

Almost surely, 2^202221000021 is an apocalyptic number.

It is an amenable number.

202221000021 is a deficient number, since it is larger than the sum of its proper divisors (79233846827).

202221000021 is a wasteful number, since it uses less digits than its factorization.

202221000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29865852.

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 202221000021 its reverse (120000122202), we get a palindrome (322221122223).

The spelling of 202221000021 in words is "two hundred two billion, two hundred twenty-one million, twenty-one", and thus it is an aban number.