1211002211220 has 24 divisors (see below), whose sum is σ = 3390806191584. Its totient is φ = 322933922976.

The previous prime is 1211002211207. The next prime is 1211002211267. The reversal of 1211002211220 is 221122001121.

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 1211002211220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10091685034 + ... + 10091685153.

It is an arithmetic number, because the mean of its divisors is an integer number (141283591316).

Almost surely, 2^{1211002211220} is an apocalyptic number.

1211002211220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211002211220 is an abundant number, since it is smaller than the sum of its proper divisors (2179803980364).

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

1211002211220 is a wasteful number, since it uses less digits than its factorization.

1211002211220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20183370199 (or 20183370197 counting only the distinct ones).

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

Adding to 1211002211220 its reverse (221122001121), we get a palindrome (1432124212341).

The spelling of 1211002211220 in words is "one trillion, two hundred eleven billion, two million, two hundred eleven thousand, two hundred twenty".