21134366 has 16 divisors (see below), whose sum is σ = 36618480. Its totient is φ = 9041280.

The previous prime is 21134353. The next prime is 21134369. The reversal of 21134366 is 66343112.

It is a super-2 number, since 2×21134366² = 893322852443912, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21134369) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27881 + ... + 28628.

It is an arithmetic number, because the mean of its divisors is an integer number (2288655).

Almost surely, 2^21134366 is an apocalyptic number.

21134366 is a deficient number, since it is larger than the sum of its proper divisors (15484114).

21134366 is a wasteful number, since it uses less digits than its factorization.

21134366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56539.

The product of its digits is 2592, while the sum is 26.

The square root of 21134366 is about 4597.2128512828. The cubic root of 21134366 is about 276.4795886950.

Adding to 21134366 its reverse (66343112), we get a palindrome (87477478).

The spelling of 21134366 in words is "twenty-one million, one hundred thirty-four thousand, three hundred sixty-six".