21945363 has 8 divisors (see below), whose sum is σ = 31920576. Its totient is φ = 13300200.

The previous prime is 21945347. The next prime is 21945367. The reversal of 21945363 is 36354912.

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

It is not a de Polignac number, because 21945363 - 2⁴ = 21945347 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 665011 = 21945363 / (2 + 1 + 9 + 4 + 5 + 3 + 6 + 3).

It is not an unprimeable number, because it can be changed into a prime (21945367) 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, 332473 + ... + 332538.

It is an arithmetic number, because the mean of its divisors is an integer number (3990072).

Almost surely, 2^21945363 is an apocalyptic number.

21945363 is a deficient number, since it is larger than the sum of its proper divisors (9975213).

21945363 is a wasteful number, since it uses less digits than its factorization.

21945363 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 665025.

The product of its digits is 19440, while the sum is 33.

The square root of 21945363 is about 4684.5878153793. The cubic root of 21945363 is about 279.9717786182.

It can be divided in two parts, 2194 and 5363, that added together give a palindrome (7557).

The spelling of 21945363 in words is "twenty-one million, nine hundred forty-five thousand, three hundred sixty-three".