221022101122221 has 64 divisors (see below), whose sum is σ = 371487704924160. Its totient is φ = 113979180948480.

The previous prime is 221022101122183. The next prime is 221022101122247. The reversal of 221022101122221 is 122221101220122.

221022101122221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 221022101122221 - 2⁷ = 221022101122093 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221022101122271) 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, 90405051 + ... + 92817656.

It is an arithmetic number, because the mean of its divisors is an integer number (5804495389440).

Almost surely, 2^{221022101122221} is an apocalyptic number.

221022101122221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

221022101122221 is a deficient number, since it is larger than the sum of its proper divisors (150465603801939).

221022101122221 is a wasteful number, since it uses less digits than its factorization.

221022101122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183222874.

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

Adding to 221022101122221 its reverse (122221101220122), we get a palindrome (343243202342343).

The spelling of 221022101122221 in words is "two hundred twenty-one trillion, twenty-two billion, one hundred one million, one hundred twenty-two thousand, two hundred twenty-one".