21210043120 has 40 divisors (see below), whose sum is σ = 56358116064. Its totient is φ = 7272014592.

The previous prime is 21210043117. The next prime is 21210043177. The reversal of 21210043120 is 2134001212.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 21210043094 and 21210043103.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 18936979 + ... + 18938098.

Almost surely, 2^21210043120 is an apocalyptic number.

21210043120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21210043120 is an abundant number, since it is smaller than the sum of its proper divisors (35148072944).

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

21210043120 is a wasteful number, since it uses less digits than its factorization.

21210043120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37875097 (or 37875091 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21210043120 its reverse (2134001212), we get a palindrome (23344044332).

The spelling of 21210043120 in words is "twenty-one billion, two hundred ten million, forty-three thousand, one hundred twenty".