221100011021001 has 32 divisors (see below), whose sum is σ = 348586272599040. Its totient is φ = 121967230545216.

The previous prime is 221100011020997. The next prime is 221100011021011. The reversal of 221100011021001 is 100120110001122.

It is not a de Polignac number, because 221100011021001 - 2² = 221100011020997 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221100011021011) 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, 24330411 + ... + 32158496.

It is an arithmetic number, because the mean of its divisors is an integer number (10893321018720).

Almost surely, 2^{221100011021001} is an apocalyptic number.

221100011021001 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

221100011021001 is a deficient number, since it is larger than the sum of its proper divisors (127486261578039).

221100011021001 is a wasteful number, since it uses less digits than its factorization.

221100011021001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56495373.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 221100011021001 its reverse (100120110001122), we get a palindrome (321220121022123).

The spelling of 221100011021001 in words is "two hundred twenty-one trillion, one hundred billion, eleven million, twenty-one thousand, one".