20211221002222 has 4 divisors (see below), whose sum is σ = 30316831503336. Its totient is φ = 10105610501110.

The previous prime is 20211221002183. The next prime is 20211221002223. The reversal of 20211221002222 is 22220012211202.

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

It is a super-2 number, since 2×20211221002222² (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 20211221002222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20211221002223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5052805250554 + ... + 5052805250557.

It is an arithmetic number, because the mean of its divisors is an integer number (7579207875834).

Almost surely, 2^{20211221002222} is an apocalyptic number.

20211221002222 is a deficient number, since it is larger than the sum of its proper divisors (10105610501114).

20211221002222 is a wasteful number, since it uses less digits than its factorization.

20211221002222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10105610501113.

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

Adding to 20211221002222 its reverse (22220012211202), we get a palindrome (42431233213424).

The spelling of 20211221002222 in words is "twenty trillion, two hundred eleven billion, two hundred twenty-one million, two thousand, two hundred twenty-two".