1012221221100 has 72 divisors (see below), whose sum is σ = 3007847308368. Its totient is φ = 262630368000.

The previous prime is 1012221221093. The next prime is 1012221221129. The reversal of 1012221221100 is 11221222101.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1012221221100.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 45584451 + ... + 45606650.

Almost surely, 2^{1012221221100} is an apocalyptic number.

1012221221100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1012221221100 is an abundant number, since it is smaller than the sum of its proper divisors (1995626087268).

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

1012221221100 is a wasteful number, since it uses less digits than its factorization.

1012221221100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91191155 (or 91191148 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1012221221100 its reverse (11221222101), we get a palindrome (1023442443201).

It can be divided in two parts, 1012221 and 221100, that added together give a palindrome (1233321).

The spelling of 1012221221100 in words is "one trillion, twelve billion, two hundred twenty-one million, two hundred twenty-one thousand, one hundred".