1220000021220 has 96 divisors (see below), whose sum is σ = 3490035107328. Its totient is φ = 318287757312.

The previous prime is 1220000021203. The next prime is 1220000021243. The reversal of 1220000021220 is 221200000221.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 1220000021196 and 1220000021205.

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, 7297284 + ... + 7462596.

It is an arithmetic number, because the mean of its divisors is an integer number (36354532368).

Almost surely, 2^{1220000021220} is an apocalyptic number.

1220000021220 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 1220000021220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1745017553664).

1220000021220 is an abundant number, since it is smaller than the sum of its proper divisors (2270035086108).

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

1220000021220 is a wasteful number, since it uses less digits than its factorization.

1220000021220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167989 (or 167987 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 1220000021220 its reverse (221200000221), we get a palindrome (1441200021441).

The spelling of 1220000021220 in words is "one trillion, two hundred twenty billion, twenty-one thousand, two hundred twenty".