21363081 has 8 divisors (see below), whose sum is σ = 29021760. Its totient is φ = 13973232.

The previous prime is 21363079. The next prime is 21363103. The reversal of 21363081 is 18036312.

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

It is not a de Polignac number, because 21363081 - 2¹ = 21363079 is a prime.

It is a super-2 number, since 2×21363081² = 912762459625122, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21363031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67021 + ... + 67338.

It is an arithmetic number, because the mean of its divisors is an integer number (3627720).

Almost surely, 2^21363081 is an apocalyptic number.

It is an amenable number.

21363081 is a deficient number, since it is larger than the sum of its proper divisors (7658679).

21363081 is a wasteful number, since it uses less digits than its factorization.

21363081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134415.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 21363081 is about 4622.0213110716. The cubic root of 21363081 is about 277.4733616179.

Adding to 21363081 its reverse (18036312), we get a palindrome (39399393).

The spelling of 21363081 in words is "twenty-one million, three hundred sixty-three thousand, eighty-one".