21368377 has 8 divisors (see below), whose sum is σ = 22194656. Its totient is φ = 20557152.

The previous prime is 21368363. The next prime is 21368387. The reversal of 21368377 is 77386312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21368377 - 2¹¹ = 21366329 is a prime.

It is a super-2 number, since 2×21368377² = 913215071228258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21368387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 828 + ... + 6589.

It is an arithmetic number, because the mean of its divisors is an integer number (2774332).

Almost surely, 2^21368377 is an apocalyptic number.

It is an amenable number.

21368377 is a deficient number, since it is larger than the sum of its proper divisors (826279).

21368377 is an equidigital number, since it uses as much as digits as its factorization.

21368377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7527.

The product of its digits is 42336, while the sum is 37.

The square root of 21368377 is about 4622.5941850870. The cubic root of 21368377 is about 277.4962886715.

The spelling of 21368377 in words is "twenty-one million, three hundred sixty-eight thousand, three hundred seventy-seven".