221020001010221 has 8 divisors (see below), whose sum is σ = 267452774331840. Its totient is φ = 178301849554368.

The previous prime is 221020001010173. The next prime is 221020001010251. The reversal of 221020001010221 is 122010100020122.

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 221020001010221 - 2¹⁸ = 221020000748077 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221020001010196 and 221020001010205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221020001010251) 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, 928655466311 + ... + 928655466548.

It is an arithmetic number, because the mean of its divisors is an integer number (33431596791480).

Almost surely, 2^{221020001010221} is an apocalyptic number.

It is an amenable number.

221020001010221 is a deficient number, since it is larger than the sum of its proper divisors (46432773321619).

221020001010221 is a wasteful number, since it uses less digits than its factorization.

221020001010221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1857310932883.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 221020001010221 its reverse (122010100020122), we get a palindrome (343030101030343).

Subtracting from 221020001010221 its reverse (122010100020122), we obtain a palindrome (99009900990099).

The spelling of 221020001010221 in words is "two hundred twenty-one trillion, twenty billion, one million, ten thousand, two hundred twenty-one".