21025152 has 48 divisors (see below), whose sum is σ = 60505380. Its totient is φ = 7008000.

The previous prime is 21025129. The next prime is 21025157. The reversal of 21025152 is 25152012.

It is a tau number, because it is divible by the number of its divisors (48).

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 (21025157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7974 + ... + 10277.

Almost surely, 2^21025152 is an apocalyptic number.

It is an amenable number.

21025152 is an abundant number, since it is smaller than the sum of its proper divisors (39480228).

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

21025152 is a wasteful number, since it uses less digits than its factorization.

21025152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18271 (or 18256 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 21025152 is about 4585.3191819109. The cubic root of 21025152 is about 276.0025204559.

Adding to 21025152 its reverse (25152012), we get a palindrome (46177164).

The spelling of 21025152 in words is "twenty-one million, twenty-five thousand, one hundred fifty-two".