21113433425 has 12 divisors (see below), whose sum is σ = 29920751616. Its totient is φ = 14477782800.

The previous prime is 21113433409. The next prime is 21113433427. The reversal of 21113433425 is 52433431112.

It is not a de Polignac number, because 21113433425 - 2⁴ = 21113433409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21113433427) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 60323921 + ... + 60324270.

It is an arithmetic number, because the mean of its divisors is an integer number (2493395968).

Almost surely, 2^21113433425 is an apocalyptic number.

21113433425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21113433425 is a deficient number, since it is larger than the sum of its proper divisors (8807318191).

21113433425 is a wasteful number, since it uses less digits than its factorization.

21113433425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120648208 (or 120648203 counting only the distinct ones).

The product of its digits is 8640, while the sum is 29.

Adding to 21113433425 its reverse (52433431112), we get a palindrome (73546864537).

The spelling of 21113433425 in words is "twenty-one billion, one hundred thirteen million, four hundred thirty-three thousand, four hundred twenty-five".