21529148 has 6 divisors (see below), whose sum is σ = 37676016. Its totient is φ = 10764572.

The previous prime is 21529133. The next prime is 21529169. The reversal of 21529148 is 84192512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2691140 + ... + 2691147.

It is an arithmetic number, because the mean of its divisors is an integer number (6279336).

Almost surely, 2^21529148 is an apocalyptic number.

It is an amenable number.

21529148 is a deficient number, since it is larger than the sum of its proper divisors (16146868).

21529148 is a wasteful number, since it uses less digits than its factorization.

21529148 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5382291 (or 5382289 counting only the distinct ones).

The product of its digits is 5760, while the sum is 32.

The square root of 21529148 is about 4639.9512928478. The cubic root of 21529148 is about 278.1904910454.

The spelling of 21529148 in words is "twenty-one million, five hundred twenty-nine thousand, one hundred forty-eight".