1220523422520 has 128 divisors (see below), whose sum is σ = 3747345719040. Its totient is φ = 317850946560.

The previous prime is 1220523422519. The next prime is 1220523422527. The reversal of 1220523422520 is 252243250221.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220523422527) 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, 38255775 + ... + 38287665.

It is an arithmetic number, because the mean of its divisors is an integer number (29276138430).

Almost surely, 2^{1220523422520} is an apocalyptic number.

1220523422520 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 1220523422520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1873672859520).

1220523422520 is an abundant number, since it is smaller than the sum of its proper divisors (2526822296520).

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

1220523422520 is a wasteful number, since it uses less digits than its factorization.

1220523422520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39365 (or 39361 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 30.

Adding to 1220523422520 its reverse (252243250221), we get a palindrome (1472766672741).

The spelling of 1220523422520 in words is "one trillion, two hundred twenty billion, five hundred twenty-three million, four hundred twenty-two thousand, five hundred twenty".