21148752 has 40 divisors (see below), whose sum is σ = 54800064. Its totient is φ = 7028224.

The previous prime is 21148723. The next prime is 21148759. The reversal of 21148752 is 25784112.

It is a super-2 number, since 2×21148752² = 894539422315008, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21148759) 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, 28093 + ... + 28835.

Almost surely, 2^21148752 is an apocalyptic number.

It is an amenable number.

21148752 is an abundant number, since it is smaller than the sum of its proper divisors (33651312).

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

21148752 is a wasteful number, since it uses less digits than its factorization.

21148752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1347 (or 1341 counting only the distinct ones).

The product of its digits is 4480, while the sum is 30.

The square root of 21148752 is about 4598.7772287859. Note that the first 3 decimals coincide. The cubic root of 21148752 is about 276.5423069747.

The spelling of 21148752 in words is "twenty-one million, one hundred forty-eight thousand, seven hundred fifty-two".