21120445363 has 4 divisors (see below), whose sum is σ = 22362824520. Its totient is φ = 19878066208.

The previous prime is 21120445361. The next prime is 21120445403. The reversal of 21120445363 is 36354402112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21120445363 - 2¹ = 21120445361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21120445361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 621189553 + ... + 621189586.

It is an arithmetic number, because the mean of its divisors is an integer number (5590706130).

Almost surely, 2^21120445363 is an apocalyptic number.

21120445363 is a deficient number, since it is larger than the sum of its proper divisors (1242379157).

21120445363 is a wasteful number, since it uses less digits than its factorization.

21120445363 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1242379156.

The product of its (nonzero) digits is 17280, while the sum is 31.

Adding to 21120445363 its reverse (36354402112), we get a palindrome (57474847475).

The spelling of 21120445363 in words is "twenty-one billion, one hundred twenty million, four hundred forty-five thousand, three hundred sixty-three".