21447310 has 8 divisors (see below), whose sum is σ = 38605176. Its totient is φ = 8578920.

The previous prime is 21447301. The next prime is 21447311. The reversal of 21447310 is 1374412.

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

It is a super-2 number, since 2×21447310² = 919974212472200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21447311) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1072356 + ... + 1072375.

It is an arithmetic number, because the mean of its divisors is an integer number (4825647).

Almost surely, 2^21447310 is an apocalyptic number.

21447310 is a deficient number, since it is larger than the sum of its proper divisors (17157866).

21447310 is a wasteful number, since it uses less digits than its factorization.

21447310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2144738.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 21447310 is about 4631.1240536181. The cubic root of 21447310 is about 277.8375515218.

It can be divided in two parts, 214 and 47310, that added together give a square (47524 = 218²).

The spelling of 21447310 in words is "twenty-one million, four hundred forty-seven thousand, three hundred ten".