21049385 has 8 divisors (see below), whose sum is σ = 28867776. Its totient is φ = 14433840.

The previous prime is 21049363. The next prime is 21049387. The reversal of 21049385 is 58394012.

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

It is not a de Polignac number, because 21049385 - 2¹⁰ = 21048361 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21049387) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 300671 + ... + 300740.

It is an arithmetic number, because the mean of its divisors is an integer number (3608472).

Almost surely, 2^21049385 is an apocalyptic number.

It is an amenable number.

21049385 is a deficient number, since it is larger than the sum of its proper divisors (7818391).

21049385 is an equidigital number, since it uses as much as digits as its factorization.

21049385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 601423.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 21049385 is about 4587.9608760320. The cubic root of 21049385 is about 276.1085173291.

The spelling of 21049385 in words is "twenty-one million, forty-nine thousand, three hundred eighty-five".