21011470 has 16 divisors (see below), whose sum is σ = 37875600. Its totient is φ = 8392384.

The previous prime is 21011453. The next prime is 21011503. The reversal of 21011470 is 7411012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9489 + ... + 11491.

It is an arithmetic number, because the mean of its divisors is an integer number (2367225).

Almost surely, 2^21011470 is an apocalyptic number.

21011470 is a deficient number, since it is larger than the sum of its proper divisors (16864130).

21011470 is a wasteful number, since it uses less digits than its factorization.

21011470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3059.

The product of its (nonzero) digits is 56, while the sum is 16.

The square root of 21011470 is about 4583.8270037164. The cubic root of 21011470 is about 275.9426384328.

Adding to 21011470 its reverse (7411012), we get a palindrome (28422482).

The spelling of 21011470 in words is "twenty-one million, eleven thousand, four hundred seventy".