22221001 has 4 divisors (see below), whose sum is σ = 24241104. Its totient is φ = 20200900.

The previous prime is 22220987. The next prime is 22221007. The reversal of 22221001 is 10012222.

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 a cyclic number.

It is not a de Polignac number, because 22221001 - 2⁹ = 22220489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22221007) 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, 1010035 + ... + 1010056.

It is an arithmetic number, because the mean of its divisors is an integer number (6060276).

Almost surely, 2^22221001 is an apocalyptic number.

It is an amenable number.

22221001 is a deficient number, since it is larger than the sum of its proper divisors (2020103).

22221001 is a wasteful number, since it uses less digits than its factorization.

22221001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2020102.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 22221001 is about 4713.9156759535. The cubic root of 22221001 is about 281.1390715793.

Adding to 22221001 its reverse (10012222), we get a palindrome (32233223).

It can be divided in two parts, 2222 and 1001, that multiplied together give a palindrome (2224222).

The spelling of 22221001 in words is "twenty-two million, two hundred twenty-one thousand, one".