21440522550245 has 4 divisors (see below), whose sum is σ = 25728627060300. Its totient is φ = 17152418040192.

The previous prime is 21440522550233. The next prime is 21440522550281. The reversal of 21440522550245 is 54205522504412.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8895318180004 + 12545204370241 = 2982502^2 + 3541921^2 .

It is a cyclic number.

It is not a de Polignac number, because 21440522550245 - 2⁸ = 21440522549989 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2144052255020 + ... + 2144052255029.

It is an arithmetic number, because the mean of its divisors is an integer number (6432156765075).

Almost surely, 2^{21440522550245} is an apocalyptic number.

It is an amenable number.

21440522550245 is a deficient number, since it is larger than the sum of its proper divisors (4288104510055).

21440522550245 is an equidigital number, since it uses as much as digits as its factorization.

21440522550245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4288104510054.

The product of its (nonzero) digits is 640000, while the sum is 41.

The spelling of 21440522550245 in words is "twenty-one trillion, four hundred forty billion, five hundred twenty-two million, five hundred fifty thousand, two hundred forty-five".