21019485 has 16 divisors (see below), whose sum is σ = 33696000. Its totient is φ = 11188800.

The previous prime is 21019459. The next prime is 21019487. The reversal of 21019485 is 58491012.

It is a happy number.

It is not a de Polignac number, because 21019485 - 2¹⁰ = 21018461 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21019487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9516 + ... + 11514.

It is an arithmetic number, because the mean of its divisors is an integer number (2106000).

Almost surely, 2^21019485 is an apocalyptic number.

It is an amenable number.

21019485 is a deficient number, since it is larger than the sum of its proper divisors (12676515).

21019485 is a wasteful number, since it uses less digits than its factorization.

21019485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2708.

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 21019485 is about 4584.7011898269. The cubic root of 21019485 is about 275.9777208439.

The spelling of 21019485 in words is "twenty-one million, nineteen thousand, four hundred eighty-five".