21082010 has 16 divisors (see below), whose sum is σ = 38205000. Its totient is φ = 8375616.

The previous prime is 21082003. The next prime is 21082013. The reversal of 21082010 is 1028012.

It can be written as a sum of positive squares in 4 ways, for example, as 17648401 + 3433609 = 4201^2 + 1853^2 .

It is a super-2 number, since 2×21082010² = 888902291280200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21082013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5585 + ... + 8564.

Almost surely, 2^21082010 is an apocalyptic number.

21082010 is a deficient number, since it is larger than the sum of its proper divisors (17122990).

21082010 is a wasteful number, since it uses less digits than its factorization.

21082010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14305.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 21082010 is about 4591.5150005200. The cubic root of 21082010 is about 276.2510929981.

The spelling of 21082010 in words is "twenty-one million, eighty-two thousand, ten".