21299480 has 64 divisors (see below), whose sum is σ = 50284800. Its totient is φ = 8110080.

The previous prime is 21299471. The next prime is 21299489. The reversal of 21299480 is 8499212.

It is an interprime number because it is at equal distance from previous prime (21299471) and next prime (21299489).

It is a self number, because there is not a number n which added to its sum of digits gives 21299480.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21299489) 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 15 ways as a sum of consecutive naturals, for example, 110264 + ... + 110456.

It is an arithmetic number, because the mean of its divisors is an integer number (785700).

Almost surely, 2^21299480 is an apocalyptic number.

21299480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21299480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25142400).

21299480 is an abundant number, since it is smaller than the sum of its proper divisors (28985320).

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

21299480 is a wasteful number, since it uses less digits than its factorization.

21299480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324 (or 320 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 21299480 is about 4615.1359676612. The cubic root of 21299480 is about 277.1977283820.

The spelling of 21299480 in words is "twenty-one million, two hundred ninety-nine thousand, four hundred eighty".