21768108 has 24 divisors (see below), whose sum is σ = 50867712. Its totient is φ = 7245264.

The previous prime is 21768101. The next prime is 21768113. The reversal of 21768108 is 80186712.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21768101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15241 + ... + 16607.

It is an arithmetic number, because the mean of its divisors is an integer number (2119488).

Almost surely, 2^21768108 is an apocalyptic number.

It is an amenable number.

21768108 is an abundant number, since it is smaller than the sum of its proper divisors (29099604).

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

21768108 is a wasteful number, since it uses less digits than its factorization.

21768108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2701 (or 2699 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 33.

The square root of 21768108 is about 4665.6305040155. The cubic root of 21768108 is about 279.2159528436.

The spelling of 21768108 in words is "twenty-one million, seven hundred sixty-eight thousand, one hundred eight".