21440300025 has 48 divisors (see below), whose sum is σ = 35616024000. Its totient is φ = 11380776960.

The previous prime is 21440300003. The next prime is 21440300051. The reversal of 21440300025 is 52000304412.

It is not a de Polignac number, because 21440300025 - 2¹⁵ = 21440267257 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21440299974 and 21440300010.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 26501821 + ... + 26502629.

It is an arithmetic number, because the mean of its divisors is an integer number (742000500).

Almost surely, 2^21440300025 is an apocalyptic number.

21440300025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21440300025 is a deficient number, since it is larger than the sum of its proper divisors (14175723975).

21440300025 is a wasteful number, since it uses less digits than its factorization.

21440300025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2058 (or 2053 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

Adding to 21440300025 its reverse (52000304412), we get a palindrome (73440604437).

The spelling of 21440300025 in words is "twenty-one billion, four hundred forty million, three hundred thousand, twenty-five".