21503034210325 has 6 divisors (see below), whose sum is σ = 26663762420834. Its totient is φ = 17202427368240.

The previous prime is 21503034210241. The next prime is 21503034210337. The reversal of 21503034210325 is 52301243030512.

It can be written as a sum of positive squares in 3 ways, for example, as 2039072617521 + 19463961592804 = 1427961^2 + 4411798^2 .

It is a de Polignac number, because none of the positive numbers 2^k-21503034210325 is a prime.

It is a super-3 number, since 3×21503034210325³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 430060684182 + ... + 430060684231.

Almost surely, 2^{21503034210325} is an apocalyptic number.

21503034210325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21503034210325 is a deficient number, since it is larger than the sum of its proper divisors (5160728210509).

21503034210325 is an equidigital number, since it uses as much as digits as its factorization.

21503034210325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 860121368423 (or 860121368418 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 31.

Adding to 21503034210325 its reverse (52301243030512), we get a palindrome (73804277240837).

The spelling of 21503034210325 in words is "twenty-one trillion, five hundred three billion, thirty-four million, two hundred ten thousand, three hundred twenty-five".