21001222220222 has 8 divisors (see below), whose sum is σ = 31501923431016. Its totient is φ = 10500581076552.

The previous prime is 21001222220203. The next prime is 21001222220243. The reversal of 21001222220222 is 22202222210012.

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

It is a junction number, because it is equal to n+sod(n) for n = 21001222220194 and 21001222220203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14132288 + ... + 15547475.

It is an arithmetic number, because the mean of its divisors is an integer number (3937740428877).

Almost surely, 2^{21001222220222} is an apocalyptic number.

21001222220222 is a deficient number, since it is larger than the sum of its proper divisors (10500701210794).

21001222220222 is a wasteful number, since it uses less digits than its factorization.

21001222220222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30033562.

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 21001222220222 its reverse (22202222210012), we get a palindrome (43203444430234).

The spelling of 21001222220222 in words is "twenty-one trillion, one billion, two hundred twenty-two million, two hundred twenty thousand, two hundred twenty-two".