21345132005 has 8 divisors (see below), whose sum is σ = 25853543712. Its totient is φ = 16916515408.

The previous prime is 21345131987. The next prime is 21345132023. The reversal of 21345132005 is 50023154312.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21345131987) and next prime (21345132023).

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 21345132005 - 2²⁰ = 21344083429 is a prime.

It is a super-2 number, since 2×21345132005² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 19948187 + ... + 19949256.

It is an arithmetic number, because the mean of its divisors is an integer number (3231692964).

Almost surely, 2^21345132005 is an apocalyptic number.

It is an amenable number.

21345132005 is a deficient number, since it is larger than the sum of its proper divisors (4508411707).

21345132005 is a wasteful number, since it uses less digits than its factorization.

21345132005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39897555.

The product of its (nonzero) digits is 3600, while the sum is 26.

Adding to 21345132005 its reverse (50023154312), we get a palindrome (71368286317).

The spelling of 21345132005 in words is "twenty-one billion, three hundred forty-five million, one hundred thirty-two thousand, five".