7121100 has 72 divisors (see below), whose sum is σ = 23554048. Its totient is φ = 1627200.

The previous prime is 7121089. The next prime is 7121137. The reversal of 7121100 is 11217.

It is a super-3 number, since 3×7121100³ (a number of 22 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 405 + ... + 3795.

Almost surely, 2^7121100 is an apocalyptic number.

7121100 is a gapful number since it is divisible by the number (70) 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 7121100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11777024).

7121100 is an abundant number, since it is smaller than the sum of its proper divisors (16432948).

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

7121100 is a wasteful number, since it uses less digits than its factorization.

7121100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3415 (or 3408 counting only the distinct ones).

The product of its (nonzero) digits is 14, while the sum is 12.

The square root of 7121100 is about 2668.5389260792. The cubic root of 7121100 is about 192.3899410229.

Adding to 7121100 its reverse (11217), we get a palindrome (7132317).

The spelling of 7121100 in words is "seven million, one hundred twenty-one thousand, one hundred".