21362642 has 16 divisors (see below), whose sum is σ = 38776320. Its totient is φ = 8616768.

The previous prime is 21362641. The next prime is 21362651. The reversal of 21362642 is 24626312.

It is not an unprimeable number, because it can be changed into a prime (21362641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44642 + ... + 45117.

It is an arithmetic number, because the mean of its divisors is an integer number (2423520).

Almost surely, 2^21362642 is an apocalyptic number.

21362642 is a deficient number, since it is larger than the sum of its proper divisors (17413678).

21362642 is a wasteful number, since it uses less digits than its factorization.

21362642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89785.

The product of its digits is 3456, while the sum is 26.

The square root of 21362642 is about 4621.9738207826. The cubic root of 21362642 is about 277.4714609614.

Adding to 21362642 its reverse (24626312), we get a palindrome (45988954).

The spelling of 21362642 in words is "twenty-one million, three hundred sixty-two thousand, six hundred forty-two".