21212211020110 has 64 divisors (see below), whose sum is σ = 44121356268480. Its totient is φ = 7256813598720.

The previous prime is 21212211020089. The next prime is 21212211020111. The reversal of 21212211020110 is 1102011221212.

It is a super-2 number, since 2×21212211020110² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212211020111) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2229856 + ... + 6884524.

It is an arithmetic number, because the mean of its divisors is an integer number (689396191695).

Almost surely, 2^{21212211020110} is an apocalyptic number.

21212211020110 is an abundant number, since it is smaller than the sum of its proper divisors (22909145248370).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21212211020110 is a wasteful number, since it uses less digits than its factorization.

21212211020110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4657141.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21212211020110 its reverse (1102011221212), we get a palindrome (22314222241322).

The spelling of 21212211020110 in words is "twenty-one trillion, two hundred twelve billion, two hundred eleven million, twenty thousand, one hundred ten".