21480010 has 32 divisors (see below), whose sum is σ = 42359760. Its totient is φ = 7805952.

The previous prime is 21480007. The next prime is 21480049. The reversal of 21480010 is 1008412.

21480010 = T₆₆₈ + T₆₆₉ + ... + T₇₅₂.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 19368801 + 2111209 = 4401^2 + 1453^2 .

It is a super-2 number, since 2×21480010² = 922781659200200, which contains 22 as substring.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 2752 + ... + 7108.

Almost surely, 2^21480010 is an apocalyptic number.

21480010 is a deficient number, since it is larger than the sum of its proper divisors (20879750).

21480010 is a wasteful number, since it uses less digits than its factorization.

21480010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4410.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 21480010 is about 4634.6531693321. The cubic root of 21480010 is about 277.9786830436.

Adding to 21480010 its reverse (1008412), we get a palindrome (22488422).

The spelling of 21480010 in words is "twenty-one million, four hundred eighty thousand, ten".