21232105425 has 24 divisors (see below), whose sum is σ = 39004165280. Its totient is φ = 11323789200.

The previous prime is 21232105423. The next prime is 21232105429. The reversal of 21232105425 is 52450123212.

21232105425 is a `hidden beast` number, since 2 + 1 + 23 + 210 + 5 + 425 = 666.

It is not a de Polignac number, because 21232105425 - 2¹ = 21232105423 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21232105423) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 15726811 + ... + 15728160.

Almost surely, 2^21232105425 is an apocalyptic number.

21232105425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21232105425 is a deficient number, since it is larger than the sum of its proper divisors (17772059855).

21232105425 is a wasteful number, since it uses less digits than its factorization.

21232105425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31454990 (or 31454979 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

Adding to 21232105425 its reverse (52450123212), we get a palindrome (73682228637).

The spelling of 21232105425 in words is "twenty-one billion, two hundred thirty-two million, one hundred five thousand, four hundred twenty-five".