21376306 has 32 divisors (see below), whose sum is σ = 38960640. Its totient is φ = 8600256.

The previous prime is 21376301. The next prime is 21376319. The reversal of 21376306 is 60367312.

It is not an unprimeable number, because it can be changed into a prime (21376301) 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 15 ways as a sum of consecutive naturals, for example, 14311 + ... + 15733.

It is an arithmetic number, because the mean of its divisors is an integer number (1217520).

Almost surely, 2^21376306 is an apocalyptic number.

21376306 is a deficient number, since it is larger than the sum of its proper divisors (17584334).

21376306 is a wasteful number, since it uses less digits than its factorization.

21376306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1498.

The product of its (nonzero) digits is 4536, while the sum is 28.

The square root of 21376306 is about 4623.4517408534. The cubic root of 21376306 is about 277.5306072346.

The spelling of 21376306 in words is "twenty-one million, three hundred seventy-six thousand, three hundred six".