21519485 has 16 divisors (see below), whose sum is σ = 27941760. Its totient is φ = 15816000.

The previous prime is 21519469. The next prime is 21519497. The reversal of 21519485 is 58491512.

It is not a de Polignac number, because 21519485 - 2⁴ = 21519469 is a prime.

It is a congruent number.

It is an unprimeable number.

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, 15656 + ... + 16974.

It is an arithmetic number, because the mean of its divisors is an integer number (1746360).

Almost surely, 2^21519485 is an apocalyptic number.

It is an amenable number.

21519485 is a deficient number, since it is larger than the sum of its proper divisors (6422275).

21519485 is a wasteful number, since it uses less digits than its factorization.

21519485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1588.

The product of its digits is 14400, while the sum is 35.

The square root of 21519485 is about 4638.9098934987. The cubic root of 21519485 is about 278.1488644254.

The spelling of 21519485 in words is "twenty-one million, five hundred nineteen thousand, four hundred eighty-five".