21084771 has 16 divisors (see below), whose sum is σ = 28828800. Its totient is φ = 13702848.

The previous prime is 21084751. The next prime is 21084773. The reversal of 21084771 is 17748012.

It is not a de Polignac number, because 21084771 - 2⁷ = 21084643 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21084773) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24175 + ... + 25031.

It is an arithmetic number, because the mean of its divisors is an integer number (1801800).

Almost surely, 2^21084771 is an apocalyptic number.

21084771 is a deficient number, since it is larger than the sum of its proper divisors (7744029).

21084771 is a wasteful number, since it uses less digits than its factorization.

21084771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1058.

The product of its (nonzero) digits is 3136, while the sum is 30.

The square root of 21084771 is about 4591.8156539652. The cubic root of 21084771 is about 276.2631521894.

The spelling of 21084771 in words is "twenty-one million, eighty-four thousand, seven hundred seventy-one".