21080470 has 8 divisors (see below), whose sum is σ = 37944864. Its totient is φ = 8432184.

The previous prime is 21080467. The next prime is 21080473. The reversal of 21080470 is 7408012.

It is an interprime number because it is at equal distance from previous prime (21080467) and next prime (21080473).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21080473) 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, 1054014 + ... + 1054033.

It is an arithmetic number, because the mean of its divisors is an integer number (4743108).

Almost surely, 2^21080470 is an apocalyptic number.

21080470 is a deficient number, since it is larger than the sum of its proper divisors (16864394).

21080470 is a wasteful number, since it uses less digits than its factorization.

21080470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2108054.

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 21080470 is about 4591.3472968182. The cubic root of 21080470 is about 276.2443662986.

Adding to 21080470 its reverse (7408012), we get a palindrome (28488482).

The spelling of 21080470 in words is "twenty-one million, eighty thousand, four hundred seventy".