1220021222220 has 72 divisors (see below), whose sum is σ = 3701397183120. Its totient is φ = 325280430720.

The previous prime is 1220021222213. The next prime is 1220021222261. The reversal of 1220021222220 is 222221200221.

1220021222220 is a `hidden beast` number, since 1 + 2 + 200 + 21 + 222 + 220 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1220021222193 and 1220021222202.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 397351 + ... + 1611809.

It is an arithmetic number, because the mean of its divisors is an integer number (51408294210).

Almost surely, 2^{1220021222220} is an apocalyptic number.

1220021222220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220021222220 is an abundant number, since it is smaller than the sum of its proper divisors (2481375960900).

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

1220021222220 is a wasteful number, since it uses less digits than its factorization.

1220021222220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1220055 (or 1220050 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 1220021222220 its reverse (222221200221), we get a palindrome (1442242422441).

The spelling of 1220021222220 in words is "one trillion, two hundred twenty billion, twenty-one million, two hundred twenty-two thousand, two hundred twenty".