220121220212121 has 32 divisors (see below), whose sum is σ = 295652126067840. Its totient is φ = 145672587648000.

The previous prime is 220121220212087. The next prime is 220121220212137. The reversal of 220121220212121 is 121212022121022.

220121220212121 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 220121220212121 - 2⁶ = 220121220212057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (220121220212221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2769024451 + ... + 2769103943.

It is an arithmetic number, because the mean of its divisors is an integer number (9239128939620).

Almost surely, 2^{220121220212121} is an apocalyptic number.

It is an amenable number.

220121220212121 is a deficient number, since it is larger than the sum of its proper divisors (75530905855719).

220121220212121 is a wasteful number, since it uses less digits than its factorization.

220121220212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91017.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 220121220212121 its reverse (121212022121022), we get a palindrome (341333242333143).

The spelling of 220121220212121 in words is "two hundred twenty trillion, one hundred twenty-one billion, two hundred twenty million, two hundred twelve thousand, one hundred twenty-one".