1221110012010 has 96 divisors (see below), whose sum is σ = 3415133586240. Its totient is φ = 278620140288.

The previous prime is 1221110012009. The next prime is 1221110012011. The reversal of 1221110012010 is 102100111221.

It is an interprime number because it is at equal distance from previous prime (1221110012009) and next prime (1221110012011).

It is a super-2 number, since 2×1221110012010² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1221110012011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 106477 + ... + 1566383.

It is an arithmetic number, because the mean of its divisors is an integer number (35574308190).

Almost surely, 2^{1221110012010} is an apocalyptic number.

1221110012010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221110012010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1707566793120).

1221110012010 is an abundant number, since it is smaller than the sum of its proper divisors (2194023574230).

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

1221110012010 is a wasteful number, since it uses less digits than its factorization.

1221110012010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1460500 (or 1460493 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 1221110012010 its reverse (102100111221), we get a palindrome (1323210123231).

The spelling of 1221110012010 in words is "one trillion, two hundred twenty-one billion, one hundred ten million, twelve thousand, ten".