21849365945 has 8 divisors (see below), whose sum is σ = 28602806400. Its totient is φ = 15890447920.

The previous prime is 21849365933. The next prime is 21849365971. The reversal of 21849365945 is 54956394812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-21849365945 is a prime.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 198630545 + ... + 198630654.

It is an arithmetic number, because the mean of its divisors is an integer number (3575350800).

Almost surely, 2^21849365945 is an apocalyptic number.

It is an amenable number.

21849365945 is a deficient number, since it is larger than the sum of its proper divisors (6753440455).

21849365945 is a wasteful number, since it uses less digits than its factorization.

21849365945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397261215.

The product of its digits is 9331200, while the sum is 56.

The spelling of 21849365945 in words is "twenty-one billion, eight hundred forty-nine million, three hundred sixty-five thousand, nine hundred forty-five".