21602342 has 8 divisors (see below), whose sum is σ = 34309656. Its totient is φ = 10165792.

The previous prime is 21602311. The next prime is 21602369. The reversal of 21602342 is 24320612.

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

It is a super-2 number, since 2×21602342² = 933322359769928, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 317648 + ... + 317715.

It is an arithmetic number, because the mean of its divisors is an integer number (4288707).

Almost surely, 2^21602342 is an apocalyptic number.

21602342 is a deficient number, since it is larger than the sum of its proper divisors (12707314).

21602342 is a wasteful number, since it uses less digits than its factorization.

21602342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 635382.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 21602342 is about 4647.8319677028. The cubic root of 21602342 is about 278.5053950243.

Adding to 21602342 its reverse (24320612), we get a palindrome (45922954).

The spelling of 21602342 in words is "twenty-one million, six hundred two thousand, three hundred forty-two".