21148488 has 24 divisors (see below), whose sum is σ = 57277350. Its totient is φ = 7049472.

The previous prime is 21148481. The next prime is 21148499. The reversal of 21148488 is 88484112.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 20412324 + 736164 = 4518^2 + 858^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×21148488² = 894517089372288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (21148481) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 146793 + ... + 146936.

Almost surely, 2^21148488 is an apocalyptic number.

It is an amenable number.

21148488 is an abundant number, since it is smaller than the sum of its proper divisors (36128862).

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

21148488 is a wasteful number, since it uses less digits than its factorization.

21148488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293741 (or 293734 counting only the distinct ones).

The product of its digits is 16384, while the sum is 36.

The square root of 21148488 is about 4598.7485254143. The cubic root of 21148488 is about 276.5411562768.

The spelling of 21148488 in words is "twenty-one million, one hundred forty-eight thousand, four hundred eighty-eight".