10001222221 has 4 divisors (see below), whose sum is σ = 10073173600. Its totient is φ = 9929270844.

The previous prime is 10001222207. The next prime is 10001222233. The reversal of 10001222221 is 12222210001.

It is a happy number.

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 10001222221 - 2³¹ = 7853738573 is a prime.

It is a super-3 number, since 3×10001222221³ (a number of 31 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10001222251) 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, 35975481 + ... + 35975758.

It is an arithmetic number, because the mean of its divisors is an integer number (2518293400).

Almost surely, 2^10001222221 is an apocalyptic number.

It is an amenable number.

10001222221 is a deficient number, since it is larger than the sum of its proper divisors (71951379).

10001222221 is an equidigital number, since it uses as much as digits as its factorization.

10001222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71951378.

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

Adding to 10001222221 its reverse (12222210001), we get a palindrome (22223432222).

It can be divided in two parts, 1000 and 1222221, that added together give a palindrome (1223221).

The spelling of 10001222221 in words is "ten billion, one million, two hundred twenty-two thousand, two hundred twenty-one".