21480490 has 8 divisors (see below), whose sum is σ = 38664900. Its totient is φ = 8592192.

The previous prime is 21480467. The next prime is 21480493. The reversal of 21480490 is 9408412.

It can be written as a sum of positive squares in 2 ways, for example, as 20602521 + 877969 = 4539^2 + 937^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21480490² = 922822901280200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21480493) 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 3 ways as a sum of consecutive naturals, for example, 1074015 + ... + 1074034.

Almost surely, 2^21480490 is an apocalyptic number.

21480490 is a deficient number, since it is larger than the sum of its proper divisors (17184410).

21480490 is a wasteful number, since it uses less digits than its factorization.

21480490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2148056.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 21480490 is about 4634.7049528530. The cubic root of 21480490 is about 277.9807536319.

The spelling of 21480490 in words is "twenty-one million, four hundred eighty thousand, four hundred ninety".