21016488 has 32 divisors (see below), whose sum is σ = 55632960. Its totient is φ = 6593280.

The previous prime is 21016483. The next prime is 21016507. The reversal of 21016488 is 88461012.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (21016483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25348 + ... + 26163.

It is an arithmetic number, because the mean of its divisors is an integer number (1738530).

Almost surely, 2^21016488 is an apocalyptic number.

It is an amenable number.

21016488 is an abundant number, since it is smaller than the sum of its proper divisors (34616472).

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

21016488 is a wasteful number, since it uses less digits than its factorization.

21016488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51537 (or 51533 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 30.

The square root of 21016488 is about 4584.3743302658. The cubic root of 21016488 is about 275.9646037363.

The spelling of 21016488 in words is "twenty-one million, sixteen thousand, four hundred eighty-eight".