21366374 has 8 divisors (see below), whose sum is σ = 33736440. Its totient is φ = 10120896.

The previous prime is 21366343. The next prime is 21366377. The reversal of 21366374 is 47366312.

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

It is a super-3 number, since 3×21366374³ (a number of 23 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21366374.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21366377) 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, 281099 + ... + 281174.

It is an arithmetic number, because the mean of its divisors is an integer number (4217055).

Almost surely, 2^21366374 is an apocalyptic number.

21366374 is a deficient number, since it is larger than the sum of its proper divisors (12370066).

21366374 is a wasteful number, since it uses less digits than its factorization.

21366374 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 562294.

The product of its digits is 18144, while the sum is 32.

The square root of 21366374 is about 4622.3775267713. The cubic root of 21366374 is about 277.4876178768.

The spelling of 21366374 in words is "twenty-one million, three hundred sixty-six thousand, three hundred seventy-four".