21111320425 has 24 divisors (see below), whose sum is σ = 28200972800. Its totient is φ = 15584788800.

The previous prime is 21111320401. The next prime is 21111320441. The reversal of 21111320425 is 52402311112.

It is not a de Polignac number, because 21111320425 - 2¹⁷ = 21111189353 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21111320396 and 21111320405.

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 23 ways as a sum of consecutive naturals, for example, 1190776 + ... + 1208374.

Almost surely, 2^21111320425 is an apocalyptic number.

21111320425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21111320425 is a deficient number, since it is larger than the sum of its proper divisors (7089652375).

21111320425 is a wasteful number, since it uses less digits than its factorization.

21111320425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21313 (or 21308 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

Adding to 21111320425 its reverse (52402311112), we get a palindrome (73513631537).

The spelling of 21111320425 in words is "twenty-one billion, one hundred eleven million, three hundred twenty thousand, four hundred twenty-five".