21134036 has 48 divisors (see below), whose sum is σ = 46932480. Its totient is φ = 8087520.

The previous prime is 21134021. The next prime is 21134063. The reversal of 21134036 is 63043112.

It is a junction number, because it is equal to n+sod(n) for n = 21133999 and 21134017.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17591 + ... + 18753.

It is an arithmetic number, because the mean of its divisors is an integer number (977760).

Almost surely, 2^21134036 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21134036, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23466240).

21134036 is an abundant number, since it is smaller than the sum of its proper divisors (25798444).

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

21134036 is a wasteful number, since it uses less digits than its factorization.

21134036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1244 (or 1242 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 21134036 is about 4597.1769598309. The cubic root of 21134036 is about 276.4781496685.

Adding to 21134036 its reverse (63043112), we get a palindrome (84177148).

The spelling of 21134036 in words is "twenty-one million, one hundred thirty-four thousand, thirty-six".