21106349 has 16 divisors (see below), whose sum is σ = 24058944. Its totient is φ = 18345600.

The previous prime is 21106343. The next prime is 21106361. The reversal of 21106349 is 94360112.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21106349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21106343) 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 15 ways as a sum of consecutive naturals, for example, 23462 + ... + 24344.

It is an arithmetic number, because the mean of its divisors is an integer number (1503684).

Almost surely, 2^21106349 is an apocalyptic number.

It is an amenable number.

21106349 is a deficient number, since it is larger than the sum of its proper divisors (2952595).

21106349 is a wasteful number, since it uses less digits than its factorization.

21106349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 988.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 21106349 is about 4594.1646683592. The cubic root of 21106349 is about 276.3573619534.

It can be divided in two parts, 211063 and 49, that added together give a palindrome (211112).

The spelling of 21106349 in words is "twenty-one million, one hundred six thousand, three hundred forty-nine".