21449285 has 32 divisors (see below), whose sum is σ = 30602880. Its totient is φ = 14227200.

The previous prime is 21449279. The next prime is 21449293. The reversal of 21449285 is 58294412.

It is not a de Polignac number, because 21449285 - 2⁶ = 21449221 is a prime.

It is a super-2 number, since 2×21449285² = 920143654022450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 93551 + ... + 93779.

It is an arithmetic number, because the mean of its divisors is an integer number (956340).

Almost surely, 2^21449285 is an apocalyptic number.

It is an amenable number.

21449285 is a deficient number, since it is larger than the sum of its proper divisors (9153595).

21449285 is a wasteful number, since it uses less digits than its factorization.

21449285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389.

The product of its digits is 23040, while the sum is 35.

The square root of 21449285 is about 4631.3372798793. The cubic root of 21449285 is about 277.8460795893.

The spelling of 21449285 in words is "twenty-one million, four hundred forty-nine thousand, two hundred eighty-five".