21645190850 has 48 divisors (see below), whose sum is σ = 40903024896. Its totient is φ = 8520072000.

The previous prime is 21645190841. The next prime is 21645190859. The reversal of 21645190850 is 5809154612.

It is an interprime number because it is at equal distance from previous prime (21645190841) and next prime (21645190859).

It is a junction number, because it is equal to n+sod(n) for n = 21645190798 and 21645190807.

It is not an unprimeable number, because it can be changed into a prime (21645190859) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3953615 + ... + 3959085.

It is an arithmetic number, because the mean of its divisors is an integer number (852146352).

Almost surely, 2^21645190850 is an apocalyptic number.

21645190850 is a deficient number, since it is larger than the sum of its proper divisors (19257834046).

21645190850 is a wasteful number, since it uses less digits than its factorization.

21645190850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6731 (or 6726 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 41.

The spelling of 21645190850 in words is "twenty-one billion, six hundred forty-five million, one hundred ninety thousand, eight hundred fifty".