21849051518 has 16 divisors (see below), whose sum is σ = 37482829920. Its totient is φ = 9357050976.

The previous prime is 21849051493. The next prime is 21849051557. The reversal of 21849051518 is 81515094812.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 549113 + ... + 587556.

It is an arithmetic number, because the mean of its divisors is an integer number (2342676870).

Almost surely, 2^21849051518 is an apocalyptic number.

21849051518 is a deficient number, since it is larger than the sum of its proper divisors (15633778402).

21849051518 is a wasteful number, since it uses less digits than its factorization.

21849051518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1138051.

The product of its (nonzero) digits is 115200, while the sum is 44.

The spelling of 21849051518 in words is "twenty-one billion, eight hundred forty-nine million, fifty-one thousand, five hundred eighteen".