221111100001 has 8 divisors (see below), whose sum is σ = 251699592384. Its totient is φ = 192270521520.

The previous prime is 221111099971. The next prime is 221111100011. The reversal of 221111100001 is 100001111122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 221111100001 - 2⁵ = 221111099969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221111100011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 436978206 + ... + 436978711.

It is an arithmetic number, because the mean of its divisors is an integer number (31462449048).

Almost surely, 2^221111100001 is an apocalyptic number.

It is an amenable number.

221111100001 is a deficient number, since it is larger than the sum of its proper divisors (30588492383).

221111100001 is a wasteful number, since it uses less digits than its factorization.

221111100001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 873956951.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 221111100001 its reverse (100001111122), we get a palindrome (321112211123).

The spelling of 221111100001 in words is "two hundred twenty-one billion, one hundred eleven million, one hundred thousand, one".