21387334 has 8 divisors (see below), whose sum is σ = 33115968. Its totient is φ = 10348680.

The previous prime is 21387329. The next prime is 21387337. The reversal of 21387334 is 43378312.

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

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a junction number, because it is equal to n+sod(n) for n = 21387296 and 21387305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21387337) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 172417 + ... + 172540.

It is an arithmetic number, because the mean of its divisors is an integer number (4139496).

Almost surely, 2^21387334 is an apocalyptic number.

21387334 is a deficient number, since it is larger than the sum of its proper divisors (11728634).

21387334 is a wasteful number, since it uses less digits than its factorization.

21387334 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344990.

The product of its digits is 12096, while the sum is 31.

The square root of 21387334 is about 4624.6442025306. The cubic root of 21387334 is about 277.5783248862.

The spelling of 21387334 in words is "twenty-one million, three hundred eighty-seven thousand, three hundred thirty-four".