21318350 has 24 divisors (see below), whose sum is σ = 39774240. Its totient is φ = 8501120.

The previous prime is 21318343. The next prime is 21318377. The reversal of 21318350 is 5381312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29291 + ... + 30009.

It is an arithmetic number, because the mean of its divisors is an integer number (1657260).

Almost surely, 2^21318350 is an apocalyptic number.

21318350 is a deficient number, since it is larger than the sum of its proper divisors (18455890).

21318350 is a wasteful number, since it uses less digits than its factorization.

21318350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1324 (or 1319 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 21318350 is about 4617.1798752052. The cubic root of 21318350 is about 277.2795641388.

Adding to 21318350 its reverse (5381312), we get a palindrome (26699662).

The spelling of 21318350 in words is "twenty-one million, three hundred eighteen thousand, three hundred fifty".