21040010 has 32 divisors (see below), whose sum is σ = 39716352. Its totient is φ = 8015040.

The previous prime is 21040007. The next prime is 21040039. The reversal of 21040010 is 1004012.

It is a super-3 number, since 3×21040010³ (a number of 23 digits) contains 333 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21040010.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20264 + ... + 21276.

It is an arithmetic number, because the mean of its divisors is an integer number (1241136).

Almost surely, 2^21040010 is an apocalyptic number.

21040010 is a deficient number, since it is larger than the sum of its proper divisors (18676342).

21040010 is a wasteful number, since it uses less digits than its factorization.

21040010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1118.

The product of its (nonzero) digits is 8, while the sum is 8.

The square root of 21040010 is about 4586.9390665236. The cubic root of 21040010 is about 276.0675200626.

Adding to 21040010 its reverse (1004012), we get a palindrome (22044022).

The spelling of 21040010 in words is "twenty-one million, forty thousand, ten".