21852717746 has 4 divisors (see below), whose sum is σ = 32779076622. Its totient is φ = 10926358872.

The previous prime is 21852717743. The next prime is 21852717763. The reversal of 21852717746 is 64771725812.

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

It can be written as a sum of positive squares in only one way, i.e., 14056710721 + 7796007025 = 118561^2 + 88295^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21852717694 and 21852717703.

It is not an unprimeable number, because it can be changed into a prime (21852717743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5463179435 + ... + 5463179438.

Almost surely, 2^21852717746 is an apocalyptic number.

21852717746 is a deficient number, since it is larger than the sum of its proper divisors (10926358876).

21852717746 is a wasteful number, since it uses less digits than its factorization.

21852717746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10926358875.

The product of its digits is 1317120, while the sum is 50.

The spelling of 21852717746 in words is "twenty-one billion, eight hundred fifty-two million, seven hundred seventeen thousand, seven hundred forty-six".