21498080 has 24 divisors (see below), whose sum is σ = 50789592. Its totient is φ = 8599168.

The previous prime is 21498067. The next prime is 21498083. The reversal of 21498080 is 8089412.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21498083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67022 + ... + 67341.

It is an arithmetic number, because the mean of its divisors is an integer number (2116233).

Almost surely, 2^21498080 is an apocalyptic number.

21498080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21498080 is an abundant number, since it is smaller than the sum of its proper divisors (29291512).

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

21498080 is a wasteful number, since it uses less digits than its factorization.

21498080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134378 (or 134370 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 21498080 is about 4636.6022042008. The cubic root of 21498080 is about 278.0566107993.

The spelling of 21498080 in words is "twenty-one million, four hundred ninety-eight thousand, eighty".