21135662 has 4 divisors (see below), whose sum is σ = 31703496. Its totient is φ = 10567830.

The previous prime is 21135649. The next prime is 21135677. The reversal of 21135662 is 26653112.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5283914 + ... + 5283917.

It is an arithmetic number, because the mean of its divisors is an integer number (7925874).

Almost surely, 2^21135662 is an apocalyptic number.

21135662 is a deficient number, since it is larger than the sum of its proper divisors (10567834).

21135662 is a wasteful number, since it uses less digits than its factorization.

21135662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10567833.

The product of its digits is 2160, while the sum is 26.

The square root of 21135662 is about 4597.3538040921. The cubic root of 21135662 is about 276.4852399997.

Adding to 21135662 its reverse (26653112), we get a palindrome (47788774).

The spelling of 21135662 in words is "twenty-one million, one hundred thirty-five thousand, six hundred sixty-two".