21107652 has 48 divisors (see below), whose sum is σ = 53071872. Its totient is φ = 6510240.

The previous prime is 21107641. The next prime is 21107699. The reversal of 21107652 is 25670112.

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, 7323 + ... + 9789.

It is an arithmetic number, because the mean of its divisors is an integer number (1105664).

Almost surely, 2^21107652 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 21107652, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26535936).

21107652 is an abundant number, since it is smaller than the sum of its proper divisors (31964220).

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

21107652 is a wasteful number, since it uses less digits than its factorization.

21107652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2528 (or 2526 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 21107652 is about 4594.3064764989. The cubic root of 21107652 is about 276.3630488083.

Adding to 21107652 its reverse (25670112), we get a palindrome (46777764).

The spelling of 21107652 in words is "twenty-one million, one hundred seven thousand, six hundred fifty-two".