10001222222221 has 16 divisors (see below), whose sum is σ = 10587278332800. Its totient is φ = 9421282713600.

The previous prime is 10001222222209. The next prime is 10001222222249. The reversal of 10001222222221 is 12222222210001.

It is a cyclic number.

It is not a de Polignac number, because 10001222222221 - 2²¹ = 10001220125069 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10001222222521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 347661 + ... + 4485901.

It is an arithmetic number, because the mean of its divisors is an integer number (661704895800).

Almost surely, 2^{10001222222221} is an apocalyptic number.

It is an amenable number.

10001222222221 is a deficient number, since it is larger than the sum of its proper divisors (586056110579).

10001222222221 is a wasteful number, since it uses less digits than its factorization.

10001222222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4138980.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 10001222222221 its reverse (12222222210001), we get a palindrome (22223444432222).

It can be divided in two parts, 10001 and 222222221, that added together give a palindrome (222232222).

The spelling of 10001222222221 in words is "ten trillion, one billion, two hundred twenty-two million, two hundred twenty-two thousand, two hundred twenty-one".