221020210010121 has 8 divisors (see below), whose sum is σ = 294693719136480. Its totient is φ = 147346753778592.

The previous prime is 221020210010101. The next prime is 221020210010137. The reversal of 221020210010121 is 121010012020122.

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

It is not a de Polignac number, because 221020210010121 - 2¹⁸ = 221020209747977 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221020210010121.

It is not an unprimeable number, because it can be changed into a prime (221020210010101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2148891 + ... + 21134288.

It is an arithmetic number, because the mean of its divisors is an integer number (36836714892060).

Almost surely, 2^{221020210010121} is an apocalyptic number.

It is an amenable number.

221020210010121 is a deficient number, since it is larger than the sum of its proper divisors (73673509126359).

221020210010121 is a wasteful number, since it uses less digits than its factorization.

221020210010121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26447415.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 221020210010121 its reverse (121010012020122), we get a palindrome (342030222030243).

The spelling of 221020210010121 in words is "two hundred twenty-one trillion, twenty billion, two hundred ten million, ten thousand, one hundred twenty-one".