1220023221320 has 32 divisors (see below), whose sum is σ = 2745283822200. Its totient is φ = 487968119808.

The previous prime is 1220023221317. The next prime is 1220023221323. The reversal of 1220023221320 is 231223200221.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1220023221317) and next prime (1220023221323).

It can be written as a sum of positive squares in 4 ways, for example, as 526324132324 + 693699088996 = 725482^2 + 832886^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1220023221292 and 1220023221301.

It is not an unprimeable number, because it can be changed into a prime (1220023221323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 804209 + ... + 1756928.

Almost surely, 2^{1220023221320} is an apocalyptic number.

1220023221320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220023221320 is an abundant number, since it is smaller than the sum of its proper divisors (1525260600880).

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

1220023221320 is a wasteful number, since it uses less digits than its factorization.

1220023221320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2573057 (or 2573053 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 1220023221320 its reverse (231223200221), we get a palindrome (1451246421541).

The spelling of 1220023221320 in words is "one trillion, two hundred twenty billion, twenty-three million, two hundred twenty-one thousand, three hundred twenty".