21767368 has 24 divisors (see below), whose sum is σ = 47478150. Its totient is φ = 9328704.

The previous prime is 21767357. The next prime is 21767377. The reversal of 21767368 is 86376712.

It can be written as a sum of positive squares in only one way, i.e., 21734244 + 33124 = 4662^2 + 182^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21767368.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 27373 + ... + 28156.

Almost surely, 2^21767368 is an apocalyptic number.

21767368 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21767368 is an abundant number, since it is smaller than the sum of its proper divisors (25710782).

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

21767368 is a wasteful number, since it uses less digits than its factorization.

21767368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55549 (or 55538 counting only the distinct ones).

The product of its digits is 84672, while the sum is 40.

The square root of 21767368 is about 4665.5512000191. The cubic root of 21767368 is about 279.2127888549.

The spelling of 21767368 in words is "twenty-one million, seven hundred sixty-seven thousand, three hundred sixty-eight".