1221112221010 has 64 divisors (see below), whose sum is σ = 2422063949184. Its totient is φ = 439553088000.

The previous prime is 1221112220989. The next prime is 1221112221011. The reversal of 1221112221010 is 101222111221.

It is a super-4 number, since 4×1221112221010⁴ (a number of 49 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (1221112221011) 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 31 ways as a sum of consecutive naturals, for example, 76728814 + ... + 76744726.

It is an arithmetic number, because the mean of its divisors is an integer number (37844749206).

Almost surely, 2^{1221112221010} is an apocalyptic number.

1221112221010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221112221010 is a deficient number, since it is larger than the sum of its proper divisors (1200951728174).

1221112221010 is a wasteful number, since it uses less digits than its factorization.

1221112221010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22939.

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

Adding to 1221112221010 its reverse (101222111221), we get a palindrome (1322334332231).

It can be divided in two parts, 12211 and 12221010, that added together give a palindrome (12233221).

The spelling of 1221112221010 in words is "one trillion, two hundred twenty-one billion, one hundred twelve million, two hundred twenty-one thousand, ten".