221101212222121 has 32 divisors (see below), whose sum is σ = 279157136302080. Its totient is φ = 170100250257600.

The previous prime is 221101212222067. The next prime is 221101212222127. The reversal of 221101212222121 is 121222212101122.

It is a cyclic number.

It is not a de Polignac number, because 221101212222121 - 2¹⁷ = 221101212091049 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221101212222092 and 221101212222101.

It is not an unprimeable number, because it can be changed into a prime (221101212222127) 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, 190409116 + ... + 191566786.

It is an arithmetic number, because the mean of its divisors is an integer number (8723660509440).

Almost surely, 2^{221101212222121} is an apocalyptic number.

It is an amenable number.

221101212222121 is a deficient number, since it is larger than the sum of its proper divisors (58055924079959).

221101212222121 is a wasteful number, since it uses less digits than its factorization.

221101212222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1189165.

The product of its (nonzero) digits is 256, while the sum is 22.

Adding to 221101212222121 its reverse (121222212101122), we get a palindrome (342323424323243).

The spelling of 221101212222121 in words is "two hundred twenty-one trillion, one hundred one billion, two hundred twelve million, two hundred twenty-two thousand, one hundred twenty-one".