21061152 has 144 divisors (see below), whose sum is σ = 70866432. Its totient is φ = 5806080.

The previous prime is 21061129. The next prime is 21061153. The reversal of 21061152 is 25116012.

21061152 is a `hidden beast` number, since 2 + 1 + 0 + 611 + 52 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21061153) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 62328 + ... + 62664.

It is an arithmetic number, because the mean of its divisors is an integer number (492128).

Almost surely, 2^21061152 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 21061152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35433216).

21061152 is an abundant number, since it is smaller than the sum of its proper divisors (49805280).

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

21061152 is a wasteful number, since it uses less digits than its factorization.

21061152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391 (or 380 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 21061152 is about 4589.2430748436. The cubic root of 21061152 is about 276.1599576871.

Adding to 21061152 its reverse (25116012), we get a palindrome (46177164).

The spelling of 21061152 in words is "twenty-one million, sixty-one thousand, one hundred fifty-two".