21210111020222 has 16 divisors (see below), whose sum is σ = 31913851678800. Its totient is φ = 10572174793152.

The previous prime is 21210111020177. The next prime is 21210111020227. The reversal of 21210111020222 is 22202011101212.

It is a self number, because there is not a number n which added to its sum of digits gives 21210111020222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210111020227) 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, 619223 + ... + 6542450.

It is an arithmetic number, because the mean of its divisors is an integer number (1994615729925).

Almost surely, 2^{21210111020222} is an apocalyptic number.

21210111020222 is a deficient number, since it is larger than the sum of its proper divisors (10703740658578).

21210111020222 is a wasteful number, since it uses less digits than its factorization.

21210111020222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7166267.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21210111020222 its reverse (22202011101212), we get a palindrome (43412122121434).

The spelling of 21210111020222 in words is "twenty-one trillion, two hundred ten billion, one hundred eleven million, twenty thousand, two hundred twenty-two".