21367606 has 32 divisors (see below), whose sum is σ = 37830240. Its totient is φ = 8956416.

The previous prime is 21367583. The next prime is 21367607. The reversal of 21367606 is 60676312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21367607) 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, 11985 + ... + 13651.

It is an arithmetic number, because the mean of its divisors is an integer number (1182195).

Almost surely, 2^21367606 is an apocalyptic number.

21367606 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21367606 is a deficient number, since it is larger than the sum of its proper divisors (16462634).

21367606 is a wasteful number, since it uses less digits than its factorization.

21367606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1728.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 21367606 is about 4622.5107896034. The cubic root of 21367606 is about 277.4929511507.

The spelling of 21367606 in words is "twenty-one million, three hundred sixty-seven thousand, six hundred six".