21131662 has 32 divisors (see below), whose sum is σ = 34610400. Its totient is φ = 9652608.

The previous prime is 21131653. The next prime is 21131689. The reversal of 21131662 is 26613112.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92164 + ... + 92392.

It is an arithmetic number, because the mean of its divisors is an integer number (1081575).

Almost surely, 2^21131662 is an apocalyptic number.

21131662 is a deficient number, since it is larger than the sum of its proper divisors (13478738).

21131662 is a wasteful number, since it uses less digits than its factorization.

21131662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340.

The product of its digits is 432, while the sum is 22.

The square root of 21131662 is about 4596.9187506416. The cubic root of 21131662 is about 276.4677969574.

Adding to 21131662 its reverse (26613112), we get a palindrome (47744774).

The spelling of 21131662 in words is "twenty-one million, one hundred thirty-one thousand, six hundred sixty-two".