21527352 has 144 divisors (see below), whose sum is σ = 73447920. Its totient is φ = 5575680.

The previous prime is 21527351. The next prime is 21527393. The reversal of 21527352 is 25372512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21527351) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 60808 + ... + 61160.

It is an arithmetic number, because the mean of its divisors is an integer number (510055).

Almost surely, 2^21527352 is an apocalyptic number.

21527352 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21527352, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36723960).

21527352 is an abundant number, since it is smaller than the sum of its proper divisors (51920568).

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

21527352 is a wasteful number, since it uses less digits than its factorization.

21527352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394 (or 376 counting only the distinct ones).

The product of its digits is 4200, while the sum is 27.

The square root of 21527352 is about 4639.7577522970. The cubic root of 21527352 is about 278.1827551143.

Adding to 21527352 its reverse (25372512), we get a palindrome (46899864).

The spelling of 21527352 in words is "twenty-one million, five hundred twenty-seven thousand, three hundred fifty-two".