21425405182 has 4 divisors (see below), whose sum is σ = 32138107776. Its totient is φ = 10712702590.

The previous prime is 21425405159. The next prime is 21425405207. The reversal of 21425405182 is 28150452412.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5356351294 + ... + 5356351297.

It is an arithmetic number, because the mean of its divisors is an integer number (8034526944).

Almost surely, 2^21425405182 is an apocalyptic number.

21425405182 is a deficient number, since it is larger than the sum of its proper divisors (10712702594).

21425405182 is a wasteful number, since it uses less digits than its factorization.

21425405182 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10712702593.

The product of its (nonzero) digits is 25600, while the sum is 34.

Adding to 21425405182 its reverse (28150452412), we get a palindrome (49575857594).

The spelling of 21425405182 in words is "twenty-one billion, four hundred twenty-five million, four hundred five thousand, one hundred eighty-two".