20101221002222 has 4 divisors (see below), whose sum is σ = 30151831503336. Its totient is φ = 10050610501110.

The previous prime is 20101221002197. The next prime is 20101221002243. The reversal of 20101221002222 is 22220012210102.

It is a happy number.

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

It is a super-2 number, since 2×20101221002222² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20101221002222.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5025305250554 + ... + 5025305250557.

It is an arithmetic number, because the mean of its divisors is an integer number (7537957875834).

Almost surely, 2^{20101221002222} is an apocalyptic number.

20101221002222 is a deficient number, since it is larger than the sum of its proper divisors (10050610501114).

20101221002222 is a wasteful number, since it uses less digits than its factorization.

20101221002222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10050610501113.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 20101221002222 its reverse (22220012210102), we get a palindrome (42321233212324).

The spelling of 20101221002222 in words is "twenty trillion, one hundred one billion, two hundred twenty-one million, two thousand, two hundred twenty-two".