121544221530 has 64 divisors (see below), whose sum is σ = 309143278080. Its totient is φ = 30477763584.

The previous prime is 121544221523. The next prime is 121544221583. The reversal of 121544221530 is 35122445121.

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 462991 + ... + 676349.

It is an arithmetic number, because the mean of its divisors is an integer number (4830363720).

Almost surely, 2^121544221530 is an apocalyptic number.

121544221530 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 121544221530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (154571639040).

121544221530 is an abundant number, since it is smaller than the sum of its proper divisors (187599056550).

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

121544221530 is a wasteful number, since it uses less digits than its factorization.

121544221530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214503.

The product of its (nonzero) digits is 9600, while the sum is 30.

Adding to 121544221530 its reverse (35122445121), we get a palindrome (156666666651).

The spelling of 121544221530 in words is "one hundred twenty-one billion, five hundred forty-four million, two hundred twenty-one thousand, five hundred thirty".