21662349 has 8 divisors (see below), whose sum is σ = 28925472. Its totient is φ = 14420400.

The previous prime is 21662339. The next prime is 21662351. The reversal of 21662349 is 94326612.

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

It is not a de Polignac number, because 21662349 - 2²¹ = 19565197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21662339) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 2727 + ... + 7124.

It is an arithmetic number, because the mean of its divisors is an integer number (3615684).

Almost surely, 2^21662349 is an apocalyptic number.

It is an amenable number.

21662349 is a deficient number, since it is larger than the sum of its proper divisors (7263123).

21662349 is an equidigital number, since it uses as much as digits as its factorization.

21662349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10587.

The product of its digits is 15552, while the sum is 33.

The square root of 21662349 is about 4654.2828663501. The cubic root of 21662349 is about 278.7630341053.

The spelling of 21662349 in words is "twenty-one million, six hundred sixty-two thousand, three hundred forty-nine".