1220211012120 has 128 divisors (see below), whose sum is σ = 3883926412800. Its totient is φ = 305619941376.

The previous prime is 1220211012107. The next prime is 1220211012157. The reversal of 1220211012120 is 212101120221.

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 1220211012120.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 379371 + ... + 1607589.

It is an arithmetic number, because the mean of its divisors is an integer number (30343175100).

Almost surely, 2^{1220211012120} is an apocalyptic number.

1220211012120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1220211012120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1941963206400).

1220211012120 is an abundant number, since it is smaller than the sum of its proper divisors (2663715400680).

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

1220211012120 is a wasteful number, since it uses less digits than its factorization.

1220211012120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1228737 (or 1228733 counting only the distinct ones).

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

Adding to 1220211012120 its reverse (212101120221), we get a palindrome (1432312132341).

The spelling of 1220211012120 in words is "one trillion, two hundred twenty billion, two hundred eleven million, twelve thousand, one hundred twenty".