21241002120 has 128 divisors (see below), whose sum is σ = 72236707200. Its totient is φ = 4953360384.

The previous prime is 21241002109. The next prime is 21241002149. The reversal of 21241002120 is 2120014212.

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 21241002120.

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 31 ways as a sum of consecutive naturals, for example, 328677 + ... + 387956.

It is an arithmetic number, because the mean of its divisors is an integer number (564349275).

Almost surely, 2^21241002120 is an apocalyptic number.

21241002120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21241002120 is an abundant number, since it is smaller than the sum of its proper divisors (50995705080).

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

21241002120 is a wasteful number, since it uses less digits than its factorization.

21241002120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 716679 (or 716675 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21241002120 its reverse (2120014212), we get a palindrome (23361016332).

The spelling of 21241002120 in words is "twenty-one billion, two hundred forty-one million, two thousand, one hundred twenty".