1220021120220 has 96 divisors (see below), whose sum is σ = 3912611017728. Its totient is φ = 278251725312.

The previous prime is 1220021120191. The next prime is 1220021120221. The reversal of 1220021120220 is 220211200221.

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 1220021120220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220021120221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2986192 + ... + 3370071.

It is an arithmetic number, because the mean of its divisors is an integer number (40756364768).

Almost surely, 2^{1220021120220} is an apocalyptic number.

1220021120220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220021120220 is an abundant number, since it is smaller than the sum of its proper divisors (2692589897508).

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

1220021120220 is a wasteful number, since it uses less digits than its factorization.

1220021120220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6356739 (or 6356737 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 1220021120220 its reverse (220211200221), we get a palindrome (1440232320441).

The spelling of 1220021120220 in words is "one trillion, two hundred twenty billion, twenty-one million, one hundred twenty thousand, two hundred twenty".