21003110420 has 24 divisors (see below), whose sum is σ = 44764841184. Its totient is φ = 8275851936.

The previous prime is 21003110419. The next prime is 21003110431. The reversal of 21003110420 is 2401130012.

It is a super-2 number, since 2×21003110420² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21003110395 and 21003110404.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7835642 + ... + 7838321.

It is an arithmetic number, because the mean of its divisors is an integer number (1865201716).

Almost surely, 2^21003110420 is an apocalyptic number.

21003110420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21003110420 is an abundant number, since it is smaller than the sum of its proper divisors (23761730764).

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

21003110420 is a wasteful number, since it uses less digits than its factorization.

21003110420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15674039 (or 15674037 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21003110420 its reverse (2401130012), we get a palindrome (23404240432).

The spelling of 21003110420 in words is "twenty-one billion, three million, one hundred ten thousand, four hundred twenty".