21410305025 has 12 divisors (see below), whose sum is σ = 26847081900. Its totient is φ = 16935790080.

The previous prime is 21410305013. The next prime is 21410305051. The reversal of 21410305025 is 52050301412.

It can be written as a sum of positive squares in 6 ways, for example, as 1408425841 + 20001879184 = 37529^2 + 141428^2 .

It is not a de Polignac number, because 21410305025 - 2¹² = 21410300929 is a prime.

It is a super-2 number, since 2×21410305025² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4809080 + ... + 4813529.

It is an arithmetic number, because the mean of its divisors is an integer number (2237256825).

Almost surely, 2^21410305025 is an apocalyptic number.

21410305025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21410305025 is a deficient number, since it is larger than the sum of its proper divisors (5436776875).

21410305025 is an equidigital number, since it uses as much as digits as its factorization.

21410305025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9622708 (or 9622703 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

Adding to 21410305025 its reverse (52050301412), we get a palindrome (73460606437).

The spelling of 21410305025 in words is "twenty-one billion, four hundred ten million, three hundred five thousand, twenty-five".