21602136 has 16 divisors (see below), whose sum is σ = 54005400. Its totient is φ = 7200704.

The previous prime is 21602099. The next prime is 21602137. The reversal of 21602136 is 63120612.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21602137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 450021 + ... + 450068.

Almost surely, 2^21602136 is an apocalyptic number.

It is an amenable number.

21602136 is an abundant number, since it is smaller than the sum of its proper divisors (32403264).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21602136 is a wasteful number, since it uses less digits than its factorization.

21602136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 900098 (or 900094 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 21602136 is about 4647.8098067800. The cubic root of 21602136 is about 278.5045097454.

Adding to 21602136 its reverse (63120612), we get a palindrome (84722748).

The spelling of 21602136 in words is "twenty-one million, six hundred two thousand, one hundred thirty-six".