220121101122221 has 64 divisors (see below), whose sum is σ = 253189319878656. Its totient is φ = 189572493312000.

The previous prime is 220121101122217. The next prime is 220121101122269. The reversal of 220121101122221 is 122221101121022.

It is not a de Polignac number, because 220121101122221 - 2² = 220121101122217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220121101122193 and 220121101122202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220121101122271) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 35961621041 + ... + 35961627161.

It is an arithmetic number, because the mean of its divisors is an integer number (3956083123104).

Almost surely, 2^{220121101122221} is an apocalyptic number.

It is an amenable number.

220121101122221 is a deficient number, since it is larger than the sum of its proper divisors (33068218756435).

220121101122221 is a wasteful number, since it uses less digits than its factorization.

220121101122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8382.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 220121101122221 its reverse (122221101121022), we get a palindrome (342342202243243).

The spelling of 220121101122221 in words is "two hundred twenty trillion, one hundred twenty-one billion, one hundred one million, one hundred twenty-two thousand, two hundred twenty-one".