21526152 has 32 divisors (see below), whose sum is σ = 55553280. Its totient is φ = 6943680.

The previous prime is 21526147. The next prime is 21526177. The reversal of 21526152 is 25162512.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13723 + ... + 15210.

It is an arithmetic number, because the mean of its divisors is an integer number (1736040).

Almost surely, 2^21526152 is an apocalyptic number.

It is an amenable number.

21526152 is an abundant number, since it is smaller than the sum of its proper divisors (34027128).

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

21526152 is a wasteful number, since it uses less digits than its factorization.

21526152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28973 (or 28969 counting only the distinct ones).

The product of its digits is 1200, while the sum is 24.

The square root of 21526152 is about 4639.6284333985. The cubic root of 21526152 is about 278.1775861010.

Adding to 21526152 its reverse (25162512), we get a palindrome (46688664).

The spelling of 21526152 in words is "twenty-one million, five hundred twenty-six thousand, one hundred fifty-two".