21849311746 has 4 divisors (see below), whose sum is σ = 32773967622. Its totient is φ = 10924655872.

The previous prime is 21849311741. The next prime is 21849311773. The reversal of 21849311746 is 64711394812.

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., 21812040721 + 37271025 = 147689^2 + 6105^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21849311696 and 21849311705.

It is not an unprimeable number, because it can be changed into a prime (21849311741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5462327935 + ... + 5462327938.

Almost surely, 2^21849311746 is an apocalyptic number.

21849311746 is a deficient number, since it is larger than the sum of its proper divisors (10924655876).

21849311746 is a wasteful number, since it uses less digits than its factorization.

21849311746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10924655875.

The product of its digits is 290304, while the sum is 46.

The spelling of 21849311746 in words is "twenty-one billion, eight hundred forty-nine million, three hundred eleven thousand, seven hundred forty-six".