21387414 has 8 divisors (see below), whose sum is σ = 42774840. Its totient is φ = 7129136.

The previous prime is 21387409. The next prime is 21387419. The reversal of 21387414 is 41478312.

It is an interprime number because it is at equal distance from previous prime (21387409) and next prime (21387419).

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

21387414 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21387419) 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, 1782279 + ... + 1782290.

It is an arithmetic number, because the mean of its divisors is an integer number (5346855).

Almost surely, 2^21387414 is an apocalyptic number.

21387414 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21387414 is a wasteful number, since it uses less digits than its factorization.

21387414 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3564574.

The product of its digits is 5376, while the sum is 30.

The square root of 21387414 is about 4624.6528518366. The cubic root of 21387414 is about 277.5786709826.

The spelling of 21387414 in words is "twenty-one million, three hundred eighty-seven thousand, four hundred fourteen".