221002100020121 has 8 divisors (see below), whose sum is σ = 253040693346624. Its totient is φ = 189080222881680.

The previous prime is 221002100020099. The next prime is 221002100020187. The reversal of 221002100020121 is 121020001200122.

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-221002100020121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221002100020096 and 221002100020105.

It is not an unprimeable number, because it can be changed into a prime (221002100020621) 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, 29179042955 + ... + 29179050528.

It is an arithmetic number, because the mean of its divisors is an integer number (31630086668328).

Almost surely, 2^{221002100020121} is an apocalyptic number.

It is an amenable number.

221002100020121 is a deficient number, since it is larger than the sum of its proper divisors (32038593326503).

221002100020121 is an equidigital number, since it uses as much as digits as its factorization.

221002100020121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58358094031.

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

Adding to 221002100020121 its reverse (121020001200122), we get a palindrome (342022101220243).

The spelling of 221002100020121 in words is "two hundred twenty-one trillion, two billion, one hundred million, twenty thousand, one hundred twenty-one".