221111201001 has 4 divisors (see below), whose sum is σ = 294814934672. Its totient is φ = 147407467332.

The previous prime is 221111200969. The next prime is 221111201041. The reversal of 221111201001 is 100102111122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 221111201001 - 2⁵ = 221111200969 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221111201041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36851866831 + ... + 36851866836.

It is an arithmetic number, because the mean of its divisors is an integer number (73703733668).

Almost surely, 2^221111201001 is an apocalyptic number.

It is an amenable number.

221111201001 is a deficient number, since it is larger than the sum of its proper divisors (73703733671).

221111201001 is an equidigital number, since it uses as much as digits as its factorization.

221111201001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73703733670.

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

Adding to 221111201001 its reverse (100102111122), we get a palindrome (321213312123).

The spelling of 221111201001 in words is "two hundred twenty-one billion, one hundred eleven million, two hundred one thousand, one".