21106147325 has 6 divisors (see below), whose sum is σ = 26171622714. Its totient is φ = 16884917840.

The previous prime is 21106147319. The next prime is 21106147339. The reversal of 21106147325 is 52374160112.

It can be written as a sum of positive squares in 3 ways, for example, as 5274971641 + 15831175684 = 72629^2 + 125822^2 .

It is not a de Polignac number, because 21106147325 - 2¹⁰ = 21106146301 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21106147291 and 21106147300.

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, 422122922 + ... + 422122971.

It is an arithmetic number, because the mean of its divisors is an integer number (4361937119).

Almost surely, 2^21106147325 is an apocalyptic number.

21106147325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21106147325 is a deficient number, since it is larger than the sum of its proper divisors (5065475389).

21106147325 is an equidigital number, since it uses as much as digits as its factorization.

21106147325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 844245903 (or 844245898 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 32.

The spelling of 21106147325 in words is "twenty-one billion, one hundred six million, one hundred forty-seven thousand, three hundred twenty-five".