21610036 has 24 divisors (see below), whose sum is σ = 44142336. Its totient is φ = 9063840.

The previous prime is 21610027. The next prime is 21610067. The reversal of 21610036 is 63001612.

It is a junction number, because it is equal to n+sod(n) for n = 21609995 and 21610022.

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 7 ways as a sum of consecutive naturals, for example, 6895 + ... + 9526.

It is an arithmetic number, because the mean of its divisors is an integer number (1839264).

Almost surely, 2^21610036 is an apocalyptic number.

It is an amenable number.

21610036 is an abundant number, since it is smaller than the sum of its proper divisors (22532300).

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

21610036 is a wasteful number, since it uses less digits than its factorization.

21610036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16479 (or 16477 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 21610036 is about 4648.6595917533. The cubic root of 21610036 is about 278.5384557323.

Adding to 21610036 its reverse (63001612), we get a palindrome (84611648).

The spelling of 21610036 in words is "twenty-one million, six hundred ten thousand, thirty-six".