21041210 has 16 divisors (see below), whose sum is σ = 37989000. Its totient is φ = 8390976.

The previous prime is 21041203. The next prime is 21041213. The reversal of 21041210 is 1214012.

It can be written as a sum of positive squares in 4 ways, for example, as 20912329 + 128881 = 4573^2 + 359^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21041191 and 21041200.

It is not an unprimeable number, because it can be changed into a prime (21041213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 476 + ... + 6504.

Almost surely, 2^21041210 is an apocalyptic number.

21041210 is a deficient number, since it is larger than the sum of its proper divisors (16947790).

21041210 is a wasteful number, since it uses less digits than its factorization.

21041210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6385.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 21041210 is about 4587.0698708435. The cubic root of 21041210 is about 276.0727683923.

Adding to 21041210 its reverse (1214012), we get a palindrome (22255222).

The spelling of 21041210 in words is "twenty-one million, forty-one thousand, two hundred ten".