1001212211220 has 96 divisors (see below), whose sum is σ = 3019541196672. Its totient is φ = 246411314688.

The previous prime is 1001212211191. The next prime is 1001212211221. The reversal of 1001212211220 is 221122121001.

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 1001212211220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001212211221) 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 31 ways as a sum of consecutive naturals, for example, 4734874 + ... + 4941806.

It is an arithmetic number, because the mean of its divisors is an integer number (31453554132).

Almost surely, 2^{1001212211220} is an apocalyptic number.

1001212211220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1001212211220 is an abundant number, since it is smaller than the sum of its proper divisors (2018328985452).

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

1001212211220 is a wasteful number, since it uses less digits than its factorization.

1001212211220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213161 (or 213159 counting only the distinct ones).

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

Adding to 1001212211220 its reverse (221122121001), we get a palindrome (1222334332221).

The spelling of 1001212211220 in words is "one trillion, one billion, two hundred twelve million, two hundred eleven thousand, two hundred twenty".