21825697238 has 4 divisors (see below), whose sum is σ = 32738545860. Its totient is φ = 10912848618.

The previous prime is 21825697237. The next prime is 21825697247. The reversal of 21825697238 is 83279652812.

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

It is a super-2 number, since 2×21825697238² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21825697238.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21825697237) 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 as a sum of consecutive naturals, namely, 5456424308 + ... + 5456424311.

It is an arithmetic number, because the mean of its divisors is an integer number (8184636465).

Almost surely, 2^21825697238 is an apocalyptic number.

21825697238 is a deficient number, since it is larger than the sum of its proper divisors (10912848622).

21825697238 is a wasteful number, since it uses less digits than its factorization.

21825697238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10912848621.

The product of its digits is 2903040, while the sum is 53.

The spelling of 21825697238 in words is "twenty-one billion, eight hundred twenty-five million, six hundred ninety-seven thousand, two hundred thirty-eight".