1212101102220 has 48 divisors (see below), whose sum is σ = 3393951902208. Its totient is φ = 323220406720.

The previous prime is 1212101102189. The next prime is 1212101102273. The reversal of 1212101102220 is 222011012121.

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 1212101102220.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 3264685 + ... + 3616955.

It is an arithmetic number, because the mean of its divisors is an integer number (70707331296).

Almost surely, 2^{1212101102220} is an apocalyptic number.

1212101102220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212101102220 is an abundant number, since it is smaller than the sum of its proper divisors (2181850799988).

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

1212101102220 is a wasteful number, since it uses less digits than its factorization.

1212101102220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409630 (or 409628 counting only the distinct ones).

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

Adding to 1212101102220 its reverse (222011012121), we get a palindrome (1434112114341).

Subtracting from 1212101102220 its reverse (222011012121), we obtain a palindrome (990090090099).

The spelling of 1212101102220 in words is "one trillion, two hundred twelve billion, one hundred one million, one hundred two thousand, two hundred twenty".