221021000221 has 8 divisors (see below), whose sum is σ = 252600266880. Its totient is φ = 189442943088.

The previous prime is 221021000177. The next prime is 221021000251. The reversal of 221021000221 is 122000120122.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 221021000221 - 2²³ = 221012611613 is a prime.

It is a super-3 number, since 3×221021000221³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221021000251) 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, 130515 + ... + 677551.

It is an arithmetic number, because the mean of its divisors is an integer number (31575033360).

Almost surely, 2^221021000221 is an apocalyptic number.

It is an amenable number.

221021000221 is a deficient number, since it is larger than the sum of its proper divisors (31579266659).

221021000221 is an equidigital number, since it uses as much as digits as its factorization.

221021000221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 604763.

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

Adding to 221021000221 its reverse (122000120122), we get a palindrome (343021120343).

The spelling of 221021000221 in words is "two hundred twenty-one billion, twenty-one million, two hundred twenty-one", and thus it is an aban number.