21440602 has 8 divisors (see below), whose sum is σ = 32212116. Its totient is φ = 10703232.

The previous prime is 21440597. The next prime is 21440609. The reversal of 21440602 is 20604412.

It can be written as a sum of positive squares in 2 ways, for example, as 19900521 + 1540081 = 4461^2 + 1241^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 21440602.

It is not an unprimeable number, because it can be changed into a prime (21440609) 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 3 ways as a sum of consecutive naturals, for example, 6903 + ... + 9514.

Almost surely, 2^21440602 is an apocalyptic number.

21440602 is a deficient number, since it is larger than the sum of its proper divisors (10771514).

21440602 is a wasteful number, since it uses less digits than its factorization.

21440602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17072.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 21440602 is about 4630.3997667588. The cubic root of 21440602 is about 277.8085824089.

The spelling of 21440602 in words is "twenty-one million, four hundred forty thousand, six hundred two".