221002021021121 has 8 divisors (see below), whose sum is σ = 221014052528640. Its totient is φ = 220989989908512.

The previous prime is 221002021021049. The next prime is 221002021021129. The reversal of 221002021021121 is 121120120200122.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221002021021121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221002021021121.

It is not an unprimeable number, because it can be changed into a prime (221002021021129) 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, 2288870981 + ... + 2288967533.

It is an arithmetic number, because the mean of its divisors is an integer number (27626756566080).

Almost surely, 2^{221002021021121} is an apocalyptic number.

It is an amenable number.

221002021021121 is a deficient number, since it is larger than the sum of its proper divisors (12031507519).

221002021021121 is an equidigital number, since it uses as much as digits as its factorization.

221002021021121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197455.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 221002021021121 its reverse (121120120200122), we get a palindrome (342122141221243).

The spelling of 221002021021121 in words is "two hundred twenty-one trillion, two billion, twenty-one million, twenty-one thousand, one hundred twenty-one".