21325609045 has 8 divisors (see below), whose sum is σ = 27559248696. Its totient is φ = 15748142016.

The previous prime is 21325609037. The next prime is 21325609051. The reversal of 21325609045 is 54090652312.

It can be written as a sum of positive squares in 4 ways, for example, as 68260644 + 21257348401 = 8262^2 + 145799^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21325609045 - 2³ = 21325609037 is a prime.

It is a super-2 number, since 2×21325609045² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21325608995 and 21325609013.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 164043082 + ... + 164043211.

It is an arithmetic number, because the mean of its divisors is an integer number (3444906087).

Almost surely, 2^21325609045 is an apocalyptic number.

It is an amenable number.

21325609045 is a deficient number, since it is larger than the sum of its proper divisors (6233639651).

21325609045 is a wasteful number, since it uses less digits than its factorization.

21325609045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328086311.

The product of its (nonzero) digits is 64800, while the sum is 37.

The spelling of 21325609045 in words is "twenty-one billion, three hundred twenty-five million, six hundred nine thousand, forty-five".