22221210001 has 8 divisors (see below), whose sum is σ = 22557795624. Its totient is φ = 21885494400.

The previous prime is 22221209999. The next prime is 22221210007. The reversal of 22221210001 is 10001212222.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 8611654401 + 13609555600 = 92799^2 + 116660^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 22221210001 - 2¹ = 22221209999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22221210007) 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, 165946 + ... + 268291.

It is an arithmetic number, because the mean of its divisors is an integer number (2819724453).

Almost surely, 2^22221210001 is an apocalyptic number.

It is an amenable number.

22221210001 is a deficient number, since it is larger than the sum of its proper divisors (336585623).

22221210001 is an equidigital number, since it uses as much as digits as its factorization.

22221210001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435011.

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

Adding to 22221210001 its reverse (10001212222), we get a palindrome (32222422223).

The spelling of 22221210001 in words is "twenty-two billion, two hundred twenty-one million, two hundred ten thousand, one".