21302146 has 8 divisors (see below), whose sum is σ = 32984064. Its totient is φ = 10307460.

The previous prime is 21302143. The next prime is 21302147. The reversal of 21302146 is 64120312.

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

It is not an unprimeable number, because it can be changed into a prime (21302143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 171730 + ... + 171853.

It is an arithmetic number, because the mean of its divisors is an integer number (4123008).

Almost surely, 2^21302146 is an apocalyptic number.

21302146 is a deficient number, since it is larger than the sum of its proper divisors (11681918).

21302146 is a wasteful number, since it uses less digits than its factorization.

21302146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343616.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 21302146 is about 4615.4247908508. The cubic root of 21302146 is about 277.2092932702.

Adding to 21302146 its reverse (64120312), we get a palindrome (85422458).

The spelling of 21302146 in words is "twenty-one million, three hundred two thousand, one hundred forty-six".