21325561417 has 4 divisors (see below), whose sum is σ = 21325997520. Its totient is φ = 21325125316.

The previous prime is 21325561409. The next prime is 21325561421. The reversal of 21325561417 is 71416552312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21325561417 - 2³ = 21325561409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21325661417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133867 + ... + 246112.

It is an arithmetic number, because the mean of its divisors is an integer number (5331499380).

Almost surely, 2^21325561417 is an apocalyptic number.

It is an amenable number.

21325561417 is a deficient number, since it is larger than the sum of its proper divisors (436103).

21325561417 is an equidigital number, since it uses as much as digits as its factorization.

21325561417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436102.

The product of its digits is 50400, while the sum is 37.

The spelling of 21325561417 in words is "twenty-one billion, three hundred twenty-five million, five hundred sixty-one thousand, four hundred seventeen".