221102001 has 32 divisors (see below), whose sum is σ = 337589120. Its totient is φ = 142938432.

The previous prime is 221101981. The next prime is 221102027. The reversal of 221102001 is 100201122.

It is not a de Polignac number, because 221102001 - 2⁷ = 221101873 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221102071) 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, 181671 + ... + 182883.

It is an arithmetic number, because the mean of its divisors is an integer number (10549660).

Almost surely, 2^221102001 is an apocalyptic number.

It is an amenable number.

221102001 is a deficient number, since it is larger than the sum of its proper divisors (116487119).

221102001 is a wasteful number, since it uses less digits than its factorization.

221102001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1422 (or 1416 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 221102001 is about 14869.4990164430. The cubic root of 221102001 is about 604.6873607235.

Adding to 221102001 its reverse (100201122), we get a palindrome (321303123).

The spelling of 221102001 in words is "two hundred twenty-one million, one hundred two thousand, one".