22021001 has 8 divisors (see below), whose sum is σ = 23401224. Its totient is φ = 20650240.

The previous prime is 22020991. The next prime is 22021007. The reversal of 22021001 is 10012022.

It can be written as a sum of positive squares in 4 ways, for example, as 15523600 + 6497401 = 3940^2 + 2549^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 22021001 - 2¹⁴ = 22004617 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 22021001.

It is not an unprimeable number, because it can be changed into a prime (22021007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2771 + ... + 7191.

It is an arithmetic number, because the mean of its divisors is an integer number (2925153).

Almost surely, 2^22021001 is an apocalyptic number.

It is an amenable number.

22021001 is a deficient number, since it is larger than the sum of its proper divisors (1380223).

22021001 is a wasteful number, since it uses less digits than its factorization.

22021001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4731.

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

The square root of 22021001 is about 4692.6539399363. The cubic root of 22021001 is about 280.2930647525.

Adding to 22021001 its reverse (10012022), we get a palindrome (32033023).

The spelling of 22021001 in words is "twenty-two million, twenty-one thousand, one".