21342366 has 20 divisors (see below), whose sum is σ = 47823072. Its totient is φ = 7114068.

The previous prime is 21342359. The next prime is 21342379. The reversal of 21342366 is 66324312.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 65710 + ... + 66033.

Almost surely, 2^21342366 is an apocalyptic number.

21342366 is an abundant number, since it is smaller than the sum of its proper divisors (26480706).

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

21342366 is a wasteful number, since it uses less digits than its factorization.

21342366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131757 (or 131748 counting only the distinct ones).

The product of its digits is 5184, while the sum is 27.

The square root of 21342366 is about 4619.7798648853. The cubic root of 21342366 is about 277.3836473500.

Adding to 21342366 its reverse (66324312), we get a palindrome (87666678).

The spelling of 21342366 in words is "twenty-one million, three hundred forty-two thousand, three hundred sixty-six".