21222121210222 has 8 divisors (see below), whose sum is σ = 31833235641672. Its totient is φ = 10611042663000.

The previous prime is 21222121210189. The next prime is 21222121210229. The reversal of 21222121210222 is 22201212122212.

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

It is a super-2 number, since 2×21222121210222² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21222121210193 and 21222121210202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222121210229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7440304 + ... + 9889507.

It is an arithmetic number, because the mean of its divisors is an integer number (3979154455209).

Almost surely, 2^{21222121210222} is an apocalyptic number.

21222121210222 is a deficient number, since it is larger than the sum of its proper divisors (10611114431450).

21222121210222 is a wasteful number, since it uses less digits than its factorization.

21222121210222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17942114.

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 21222121210222 its reverse (22201212122212), we get a palindrome (43423333332434).

The spelling of 21222121210222 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred twenty-one million, two hundred ten thousand, two hundred twenty-two".