21602243 has 8 divisors (see below), whose sum is σ = 23305968. Its totient is φ = 19904544.

The previous prime is 21602237. The next prime is 21602249. The reversal of 21602243 is 34220612.

It is an interprime number because it is at equal distance from previous prime (21602237) and next prime (21602249).

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

It is a cyclic number.

It is not a de Polignac number, because 21602243 - 2⁶ = 21602179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21602249) 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, 8396 + ... + 10662.

It is an arithmetic number, because the mean of its divisors is an integer number (2913246).

Almost surely, 2^21602243 is an apocalyptic number.

21602243 is a deficient number, since it is larger than the sum of its proper divisors (1703725).

21602243 is a wasteful number, since it uses less digits than its factorization.

21602243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3013.

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

The square root of 21602243 is about 4647.8213175637. The cubic root of 21602243 is about 278.5049695755.

Adding to 21602243 its reverse (34220612), we get a palindrome (55822855).

The spelling of 21602243 in words is "twenty-one million, six hundred two thousand, two hundred forty-three".