120231215550 has 72 divisors (see below), whose sum is σ = 323303235840. Its totient is φ = 32033664000.

The previous prime is 120231215549. The next prime is 120231215551. The reversal of 120231215550 is 55512132021.

It is an interprime number because it is at equal distance from previous prime (120231215549) and next prime (120231215551).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120231215551) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 401886 + ... + 634014.

It is an arithmetic number, because the mean of its divisors is an integer number (4490322720).

Almost surely, 2^120231215550 is an apocalyptic number.

120231215550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 120231215550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (161651617920).

120231215550 is an abundant number, since it is smaller than the sum of its proper divisors (203072020290).

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

120231215550 is a wasteful number, since it uses less digits than its factorization.

120231215550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233298 (or 233290 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

Adding to 120231215550 its reverse (55512132021), we get a palindrome (175743347571).

The spelling of 120231215550 in words is "one hundred twenty billion, two hundred thirty-one million, two hundred fifteen thousand, five hundred fifty".