21049010 has 8 divisors (see below), whose sum is σ = 37888236. Its totient is φ = 8419600.

The previous prime is 21049001. The next prime is 21049019. The reversal of 21049010 is 1094012.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21049001) and next prime (21049019).

It can be written as a sum of positive squares in 2 ways, for example, as 19351201 + 1697809 = 4399^2 + 1303^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 21049010.

It is not an unprimeable number, because it can be changed into a prime (21049019) 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, 1052441 + ... + 1052460.

Almost surely, 2^21049010 is an apocalyptic number.

21049010 is a deficient number, since it is larger than the sum of its proper divisors (16839226).

21049010 is a wasteful number, since it uses less digits than its factorization.

21049010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2104908.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 21049010 is about 4587.9200080211. The cubic root of 21049010 is about 276.1068776722.

The spelling of 21049010 in words is "twenty-one million, forty-nine thousand, ten".