21031152 has 40 divisors (see below), whose sum is σ = 54902736. Its totient is φ = 6936576.

The previous prime is 21031151. The next prime is 21031163. The reversal of 21031152 is 25113012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21031151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2398 + ... + 6914.

Almost surely, 2^21031152 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 21031152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27451368).

21031152 is an abundant number, since it is smaller than the sum of its proper divisors (33871584).

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

21031152 is a wasteful number, since it uses less digits than its factorization.

21031152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4625 (or 4619 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 21031152 is about 4585.9733972190. The cubic root of 21031152 is about 276.0287724678.

Adding to 21031152 its reverse (25113012), we get a palindrome (46144164).

The spelling of 21031152 in words is "twenty-one million, thirty-one thousand, one hundred fifty-two".