21650178716 has 12 divisors (see below), whose sum is σ = 37903688760. Its totient is φ = 10820553360.

The previous prime is 21650178689. The next prime is 21650178721. The reversal of 21650178716 is 61787105612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1123250 + ... + 1142361.

It is an arithmetic number, because the mean of its divisors is an integer number (3158640730).

Almost surely, 2^21650178716 is an apocalyptic number.

It is an amenable number.

21650178716 is a deficient number, since it is larger than the sum of its proper divisors (16253510044).

21650178716 is a wasteful number, since it uses less digits than its factorization.

21650178716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2268004 (or 2268002 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 44.

The spelling of 21650178716 in words is "twenty-one billion, six hundred fifty million, one hundred seventy-eight thousand, seven hundred sixteen".