221001112212021 has 20 divisors (see below), whose sum is σ = 330138005861664. Its totient is φ = 147333832950600.

The previous prime is 221001112212007. The next prime is 221001112212073. The reversal of 221001112212021 is 120212211100122.

It is not a de Polignac number, because 221001112212021 - 2¹⁷ = 221001112080949 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221001112211985 and 221001112212003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221001112212091) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 57033166 + ... + 60784736.

Almost surely, 2^{221001112212021} is an apocalyptic number.

It is an amenable number.

221001112212021 is a deficient number, since it is larger than the sum of its proper divisors (109136893649643).

221001112212021 is an equidigital number, since it uses as much as digits as its factorization.

221001112212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4478854 (or 4478845 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 221001112212021 its reverse (120212211100122), we get a palindrome (341213323312143).

The spelling of 221001112212021 in words is "two hundred twenty-one trillion, one billion, one hundred twelve million, two hundred twelve thousand, twenty-one".