221112001 has 4 divisors (see below), whose sum is σ = 241213104. Its totient is φ = 201010900.

The previous prime is 221111983. The next prime is 221112019. The reversal of 221112001 is 100211122.

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 an interprime number because it is at equal distance from previous prime (221111983) and next prime (221112019).

It is a cyclic number.

It is not a de Polignac number, because 221112001 - 2¹⁵ = 221079233 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221112071) 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, 10050535 + ... + 10050556.

It is an arithmetic number, because the mean of its divisors is an integer number (60303276).

Almost surely, 2^221112001 is an apocalyptic number.

It is an amenable number.

221112001 is a deficient number, since it is larger than the sum of its proper divisors (20101103).

221112001 is a wasteful number, since it uses less digits than its factorization.

221112001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20101102.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 221112001 is about 14869.8352714480. The cubic root of 221112001 is about 604.6964768515.

Adding to 221112001 its reverse (100211122), we get a palindrome (321323123).

The spelling of 221112001 in words is "two hundred twenty-one million, one hundred twelve thousand, one".