221020220122121 has 8 divisors (see below), whose sum is σ = 252597491217984. Its totient is φ = 189443687510160.

The previous prime is 221020220122067. The next prime is 221020220122123. The reversal of 221020220122121 is 121221022020122.

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 221020220122121 - 2¹⁰ = 221020220121097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221020220122093 and 221020220122102.

It is not an unprimeable number, because it can be changed into a prime (221020220122123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 183979490 + ... + 185176923.

It is an arithmetic number, because the mean of its divisors is an integer number (31574686402248).

Almost surely, 2^{221020220122121} is an apocalyptic number.

It is an amenable number.

221020220122121 is a deficient number, since it is larger than the sum of its proper divisors (31577271095863).

221020220122121 is an equidigital number, since it uses as much as digits as its factorization.

221020220122121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369241951.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 221020220122121 its reverse (121221022020122), we get a palindrome (342241242142243).

The spelling of 221020220122121 in words is "two hundred twenty-one trillion, twenty billion, two hundred twenty million, one hundred twenty-two thousand, one hundred twenty-one".