221021210233021 has 8 divisors (see below), whose sum is σ = 241165978241184. Its totient is φ = 200885097343920.

The previous prime is 221021210232947. The next prime is 221021210233079. The reversal of 221021210233021 is 120332012120122.

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

It is not a de Polignac number, because 221021210233021 - 2²³ = 221021201844413 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221021210232983 and 221021210233001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221021210233081) 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, 2163726366 + ... + 2163828511.

It is an arithmetic number, because the mean of its divisors is an integer number (30145747280148).

Almost surely, 2^{221021210233021} is an apocalyptic number.

It is an amenable number.

221021210233021 is a deficient number, since it is larger than the sum of its proper divisors (20144768008163).

221021210233021 is a wasteful number, since it uses less digits than its factorization.

221021210233021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4327559531.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 221021210233021 its reverse (120332012120122), we get a palindrome (341353222353143).

The spelling of 221021210233021 in words is "two hundred twenty-one trillion, twenty-one billion, two hundred ten million, two hundred thirty-three thousand, twenty-one".