10111222221 has 8 divisors (see below), whose sum is σ = 13587784704. Its totient is φ = 6687737280.

The previous prime is 10111222213. The next prime is 10111222237. The reversal of 10111222221 is 12222211101.

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

It is not a de Polignac number, because 10111222221 - 2³ = 10111222213 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 10111222221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10111222241) 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, 13268940 + ... + 13269701.

It is an arithmetic number, because the mean of its divisors is an integer number (1698473088).

Almost surely, 2^10111222221 is an apocalyptic number.

It is an amenable number.

10111222221 is a deficient number, since it is larger than the sum of its proper divisors (3476562483).

10111222221 is a wasteful number, since it uses less digits than its factorization.

10111222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26538771.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 10111222221 its reverse (12222211101), we get a palindrome (22333433322).

The spelling of 10111222221 in words is "ten billion, one hundred eleven million, two hundred twenty-two thousand, two hundred twenty-one".