1220434554500 has 192 divisors, whose sum is σ = 3070864742400. Its totient is φ = 415056844800.

The previous prime is 1220434554461. The next prime is 1220434554509. The reversal of 1220434554500 is 54554340221.

It is a super-2 number, since 2×1220434554500² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is not an unprimeable number, because it can be changed into a prime (1220434554509) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 395088956 + ... + 395092044.

It is an arithmetic number, because the mean of its divisors is an integer number (15994087200).

Almost surely, 2^{1220434554500} is an apocalyptic number.

1220434554500 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 1220434554500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1535432371200).

1220434554500 is an abundant number, since it is smaller than the sum of its proper divisors (1850430187900).

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

1220434554500 is a wasteful number, since it uses less digits than its factorization.

1220434554500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3991 (or 3979 counting only the distinct ones).

The product of its (nonzero) digits is 96000, while the sum is 35.

Adding to 1220434554500 its reverse (54554340221), we get a palindrome (1274988894721).

The spelling of 1220434554500 in words is "one trillion, two hundred twenty billion, four hundred thirty-four million, five hundred fifty-four thousand, five hundred".