21301130165 has 8 divisors (see below), whose sum is σ = 29212978560. Its totient is φ = 14606489232.

The previous prime is 21301130131. The next prime is 21301130171. The reversal of 21301130165 is 56103110312.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21301130165 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21301130165.

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, 304301825 + ... + 304301894.

It is an arithmetic number, because the mean of its divisors is an integer number (3651622320).

Almost surely, 2^21301130165 is an apocalyptic number.

It is an amenable number.

21301130165 is a deficient number, since it is larger than the sum of its proper divisors (7911848395).

21301130165 is an equidigital number, since it uses as much as digits as its factorization.

21301130165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 608603731.

The product of its (nonzero) digits is 540, while the sum is 23.

Adding to 21301130165 its reverse (56103110312), we get a palindrome (77404240477).

The spelling of 21301130165 in words is "twenty-one billion, three hundred one million, one hundred thirty thousand, one hundred sixty-five".