121532100 has 72 divisors (see below), whose sum is σ = 353623200. Its totient is φ = 32225280.

The previous prime is 121532071. The next prime is 121532119. The reversal of 121532100 is 1235121.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 121532100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 56851 + ... + 58949.

Almost surely, 2^121532100 is an apocalyptic number.

121532100 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 121532100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (176811600).

121532100 is an abundant number, since it is smaller than the sum of its proper divisors (232091100).

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

121532100 is a wasteful number, since it uses less digits than its factorization.

121532100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2309 (or 2302 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 121532100 is about 11024.1598319328. The cubic root of 121532100 is about 495.3327015448.

Adding to 121532100 its reverse (1235121), we get a palindrome (122767221).

The spelling of 121532100 in words is "one hundred twenty-one million, five hundred thirty-two thousand, one hundred".