21552244435 has 4 divisors (see below), whose sum is σ = 25862693328. Its totient is φ = 17241795544.

The previous prime is 21552244433. The next prime is 21552244457. The reversal of 21552244435 is 53444225512.

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 21552244435 - 2¹ = 21552244433 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21552244394 and 21552244403.

It is not an unprimeable number, because it can be changed into a prime (21552244433) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2155224439 + ... + 2155224448.

It is an arithmetic number, because the mean of its divisors is an integer number (6465673332).

Almost surely, 2^21552244435 is an apocalyptic number.

21552244435 is a deficient number, since it is larger than the sum of its proper divisors (4310448893).

21552244435 is an equidigital number, since it uses as much as digits as its factorization.

21552244435 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4310448892.

The product of its digits is 192000, while the sum is 37.

Adding to 21552244435 its reverse (53444225512), we get a palindrome (74996469947).

The spelling of 21552244435 in words is "twenty-one billion, five hundred fifty-two million, two hundred forty-four thousand, four hundred thirty-five".