221003001 has 12 divisors (see below), whose sum is σ = 319408128. Its totient is φ = 147251544.

The previous prime is 221002993. The next prime is 221003011. The reversal of 221003001 is 100300122.

It is a happy number.

It is not a de Polignac number, because 221003001 - 2³ = 221002993 is a prime.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221003011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12616 + ... + 24518.

It is an arithmetic number, because the mean of its divisors is an integer number (26617344).

Almost surely, 2^221003001 is an apocalyptic number.

It is an amenable number.

221003001 is a deficient number, since it is larger than the sum of its proper divisors (98405127).

221003001 is a wasteful number, since it uses less digits than its factorization.

221003001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13972 (or 13969 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 221003001 is about 14866.1696815286. The cubic root of 221003001 is about 604.5970962219.

Adding to 221003001 its reverse (100300122), we get a palindrome (321303123).

It can be divided in two parts, 22 and 1003001, that multiplied together give a palindrome (22066022).

The spelling of 221003001 in words is "two hundred twenty-one million, three thousand, one".