21222201001 has 4 divisors (see below), whose sum is σ = 21234145492. Its totient is φ = 21210256512.

The previous prime is 21222200983. The next prime is 21222201047. The reversal of 21222201001 is 10010222212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3633075625 + 17589125376 = 60275^2 + 132624^2 .

It is a cyclic number.

It is not a de Polignac number, because 21222201001 - 2⁷ = 21222200873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21222201901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5969580 + ... + 5973133.

It is an arithmetic number, because the mean of its divisors is an integer number (5308536373).

Almost surely, 2^21222201001 is an apocalyptic number.

It is an amenable number.

21222201001 is a deficient number, since it is larger than the sum of its proper divisors (11944491).

21222201001 is a wasteful number, since it uses less digits than its factorization.

21222201001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11944490.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21222201001 its reverse (10010222212), we get a palindrome (31232423213).

The spelling of 21222201001 in words is "twenty-one billion, two hundred twenty-two million, two hundred one thousand, one".