21003430120 has 16 divisors (see below), whose sum is σ = 47257717860. Its totient is φ = 8401372032.

The previous prime is 21003430117. The next prime is 21003430169. The reversal of 21003430120 is 2103430012.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20700878884 + 302551236 = 143878^2 + 17394^2 .

It is a super-2 number, since 2×21003430120² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21003430094 and 21003430103.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 262542837 + ... + 262542916.

Almost surely, 2^21003430120 is an apocalyptic number.

21003430120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21003430120 is an abundant number, since it is smaller than the sum of its proper divisors (26254287740).

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

21003430120 is a wasteful number, since it uses less digits than its factorization.

21003430120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 525085764 (or 525085760 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21003430120 its reverse (2103430012), we get a palindrome (23106860132).

The spelling of 21003430120 in words is "twenty-one billion, three million, four hundred thirty thousand, one hundred twenty".