21348965 has 8 divisors (see below), whose sum is σ = 27947808. Its totient is φ = 15526480.

The previous prime is 21348953. The next prime is 21348997. The reversal of 21348965 is 56984312.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-21348965 is a prime.

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 (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 194027 + ... + 194136.

It is an arithmetic number, because the mean of its divisors is an integer number (3493476).

Almost surely, 2^21348965 is an apocalyptic number.

It is an amenable number.

21348965 is a deficient number, since it is larger than the sum of its proper divisors (6598843).

21348965 is a wasteful number, since it uses less digits than its factorization.

21348965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388179.

The product of its digits is 51840, while the sum is 38.

The square root of 21348965 is about 4620.4940212060. The cubic root of 21348965 is about 277.4122331539.

The spelling of 21348965 in words is "twenty-one million, three hundred forty-eight thousand, nine hundred sixty-five".