21202302455 has 4 divisors (see below), whose sum is σ = 25442762952. Its totient is φ = 16961841960.

The previous prime is 21202302439. The next prime is 21202302503. The reversal of 21202302455 is 55420320212.

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

It is not a de Polignac number, because 21202302455 - 2⁴ = 21202302439 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2120230241 + ... + 2120230250.

It is an arithmetic number, because the mean of its divisors is an integer number (6360690738).

Almost surely, 2^21202302455 is an apocalyptic number.

21202302455 is a deficient number, since it is larger than the sum of its proper divisors (4240460497).

21202302455 is an equidigital number, since it uses as much as digits as its factorization.

21202302455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4240460496.

The product of its (nonzero) digits is 4800, while the sum is 26.

Adding to 21202302455 its reverse (55420320212), we get a palindrome (76622622667).

The spelling of 21202302455 in words is "twenty-one billion, two hundred two million, three hundred two thousand, four hundred fifty-five".