27821013 has 16 divisors (see below), whose sum is σ = 41074176. Its totient is φ = 16608240.

The previous prime is 27821011. The next prime is 27821033. The reversal of 27821013 is 31012872.

It is not a de Polignac number, because 27821013 - 2¹ = 27821011 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27821011) 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, 4081 + ... + 8502.

It is an arithmetic number, because the mean of its divisors is an integer number (2567136).

Almost surely, 2^27821013 is an apocalyptic number.

It is an amenable number.

27821013 is a deficient number, since it is larger than the sum of its proper divisors (13253163).

27821013 is a wasteful number, since it uses less digits than its factorization.

27821013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12664.

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 27821013 is about 5274.5628254861. The cubic root of 27821013 is about 303.0104779132.

Adding to 27821013 its reverse (31012872), we get a palindrome (58833885).

The spelling of 27821013 in words is "twenty-seven million, eight hundred twenty-one thousand, thirteen".