21241490 has 8 divisors (see below), whose sum is σ = 38234700. Its totient is φ = 8496592.

The previous prime is 21241477. The next prime is 21241501. The reversal of 21241490 is 9414212.

It can be written as a sum of positive squares in 2 ways, for example, as 18395521 + 2845969 = 4289^2 + 1687^2 .

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1062065 + ... + 1062084.

Almost surely, 2^21241490 is an apocalyptic number.

21241490 is a deficient number, since it is larger than the sum of its proper divisors (16993210).

21241490 is a wasteful number, since it uses less digits than its factorization.

21241490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2124156.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 21241490 is about 4608.8490971174. The cubic root of 21241490 is about 276.9459333975.

The spelling of 21241490 in words is "twenty-one million, two hundred forty-one thousand, four hundred ninety".