21147310 has 16 divisors (see below), whose sum is σ = 38134800. Its totient is φ = 8443456.

The previous prime is 21147289. The next prime is 21147317. The reversal of 21147310 is 1374112.

It is a super-2 number, since 2×21147310² = 894417440472200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21147317) 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 7 ways as a sum of consecutive naturals, for example, 4986 + ... + 8194.

It is an arithmetic number, because the mean of its divisors is an integer number (2383425).

Almost surely, 2^21147310 is an apocalyptic number.

21147310 is a deficient number, since it is larger than the sum of its proper divisors (16987490).

21147310 is a wasteful number, since it uses less digits than its factorization.

21147310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3875.

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 21147310 is about 4598.6204453075. The cubic root of 21147310 is about 276.5360216066.

The spelling of 21147310 in words is "twenty-one million, one hundred forty-seven thousand, three hundred ten".