21164350 has 12 divisors (see below), whose sum is σ = 39365784. Its totient is φ = 8465720.

The previous prime is 21164327. The next prime is 21164357. The reversal of 21164350 is 5346112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21164357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 211594 + ... + 211693.

It is an arithmetic number, because the mean of its divisors is an integer number (3280482).

Almost surely, 2^21164350 is an apocalyptic number.

21164350 is a deficient number, since it is larger than the sum of its proper divisors (18201434).

21164350 is a wasteful number, since it uses less digits than its factorization.

21164350 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423299 (or 423294 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 21164350 is about 4600.4728017890. The cubic root of 21164350 is about 276.6102770513.

The spelling of 21164350 in words is "twenty-one million, one hundred sixty-four thousand, three hundred fifty".