21129614 has 16 divisors (see below), whose sum is σ = 34736256. Its totient is φ = 9559800.

The previous prime is 21129613. The next prime is 21129643. The reversal of 21129614 is 41692112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21129613) 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 7 ways as a sum of consecutive naturals, for example, 2879 + ... + 7109.

It is an arithmetic number, because the mean of its divisors is an integer number (2171016).

Almost surely, 2^21129614 is an apocalyptic number.

21129614 is a deficient number, since it is larger than the sum of its proper divisors (13606642).

21129614 is a wasteful number, since it uses less digits than its factorization.

21129614 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4471.

The product of its digits is 864, while the sum is 26.

The square root of 21129614 is about 4596.6959873370. The cubic root of 21129614 is about 276.4588652678.

The spelling of 21129614 in words is "twenty-one million, one hundred twenty-nine thousand, six hundred fourteen".