21683300525 has 6 divisors (see below), whose sum is σ = 26887292682. Its totient is φ = 17346640400.

The previous prime is 21683300521. The next prime is 21683300533. The reversal of 21683300525 is 52500338612.

It can be written as a sum of positive squares in 3 ways, for example, as 3187844521 + 18495456004 = 56461^2 + 135998^2 .

It is not a de Polignac number, because 21683300525 - 2² = 21683300521 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21683300521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 433665986 + ... + 433666035.

It is an arithmetic number, because the mean of its divisors is an integer number (4481215447).

Almost surely, 2^21683300525 is an apocalyptic number.

21683300525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21683300525 is a deficient number, since it is larger than the sum of its proper divisors (5203992157).

21683300525 is an equidigital number, since it uses as much as digits as its factorization.

21683300525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 867332031 (or 867332026 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 35.

The spelling of 21683300525 in words is "twenty-one billion, six hundred eighty-three million, three hundred thousand, five hundred twenty-five".