13121100 has 108 divisors (see below), whose sum is σ = 41976480. Its totient is φ = 3427200.

The previous prime is 13121099. The next prime is 13121117. The reversal of 13121100 is 112131.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 54781 + ... + 55019.

Almost surely, 2^13121100 is an apocalyptic number.

13121100 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 13121100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20988240).

13121100 is an abundant number, since it is smaller than the sum of its proper divisors (28855380).

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

13121100 is a wasteful number, since it uses less digits than its factorization.

13121100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320 (or 310 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 9.

The square root of 13121100 is about 3622.3058954208. The cubic root of 13121100 is about 235.8613328835.

Adding to 13121100 its reverse (112131), we get a palindrome (13233231).

The spelling of 13121100 in words is "thirteen million, one hundred twenty-one thousand, one hundred".