21850716860 has 48 divisors (see below), whose sum is σ = 52535056896. Its totient is φ = 7478340672.

The previous prime is 21850716821. The next prime is 21850716883. The reversal of 21850716860 is 6861705812.

It is a happy number.

It is a super-3 number, since 3×21850716860³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59792 + ... + 217431.

It is an arithmetic number, because the mean of its divisors is an integer number (1094480352).

Almost surely, 2^21850716860 is an apocalyptic number.

21850716860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21850716860 is an abundant number, since it is smaller than the sum of its proper divisors (30684340036).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21850716860 is a wasteful number, since it uses less digits than its factorization.

21850716860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277802 (or 277800 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 44.

The spelling of 21850716860 in words is "twenty-one billion, eight hundred fifty million, seven hundred sixteen thousand, eight hundred sixty".