21636350 has 12 divisors (see below), whose sum is σ = 40243704. Its totient is φ = 8654520.

The previous prime is 21636347. The next prime is 21636361. The reversal of 21636350 is 5363612.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 216314 + ... + 216413.

It is an arithmetic number, because the mean of its divisors is an integer number (3353642).

Almost surely, 2^21636350 is an apocalyptic number.

21636350 is a deficient number, since it is larger than the sum of its proper divisors (18607354).

21636350 is a wasteful number, since it uses less digits than its factorization.

21636350 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432739 (or 432734 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 26.

The square root of 21636350 is about 4651.4890089089. The cubic root of 21636350 is about 278.6514663102.

Adding to 21636350 its reverse (5363612), we get a palindrome (26999962).

The spelling of 21636350 in words is "twenty-one million, six hundred thirty-six thousand, three hundred fifty".