101221543500 has 384 divisors, whose sum is σ = 371170695168. Its totient is φ = 20822400000.

The previous prime is 101221543481. The next prime is 101221543523. The reversal of 101221543500 is 5345122101.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 11661162 + ... + 11669838.

It is an arithmetic number, because the mean of its divisors is an integer number (966590352).

Almost surely, 2^101221543500 is an apocalyptic number.

101221543500 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 101221543500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (185585347584).

101221543500 is an abundant number, since it is smaller than the sum of its proper divisors (269949151668).

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

101221543500 is a wasteful number, since it uses less digits than its factorization.

101221543500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8818 (or 8806 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

Adding to 101221543500 its reverse (5345122101), we get a palindrome (106566665601).

It can be divided in two parts, 1012 and 21543500, that added together give a palindrome (21544512).

The spelling of 101221543500 in words is "one hundred one billion, two hundred twenty-one million, five hundred forty-three thousand, five hundred".