1000021220221 has 8 divisors (see below), whose sum is σ = 1023595753664. Its totient is φ = 976461151680.

The previous prime is 1000021220189. The next prime is 1000021220227. The reversal of 1000021220221 is 1220221200001.

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 1000021220221 - 2⁵ = 1000021220189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000021220227) 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, 3476265 + ... + 3752926.

It is an arithmetic number, because the mean of its divisors is an integer number (127949469208).

Almost surely, 2^{1000021220221} is an apocalyptic number.

It is an amenable number.

1000021220221 is a deficient number, since it is larger than the sum of its proper divisors (23574533443).

1000021220221 is an equidigital number, since it uses as much as digits as its factorization.

1000021220221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7232451.

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

Adding to 1000021220221 its reverse (1220221200001), we get a palindrome (2220242420222).

The spelling of 1000021220221 in words is "one trillion, twenty-one million, two hundred twenty thousand, two hundred twenty-one".