27051921 has 32 divisors (see below), whose sum is σ = 44347520. Its totient is φ = 16189632.

The previous prime is 27051911. The next prime is 27051943. The reversal of 27051921 is 12915072.

It is not a de Polignac number, because 27051921 - 2⁷ = 27051793 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27051901) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 11946 + ... + 14028.

It is an arithmetic number, because the mean of its divisors is an integer number (1385860).

Almost surely, 2^27051921 is an apocalyptic number.

It is an amenable number.

27051921 is a deficient number, since it is larger than the sum of its proper divisors (17295599).

27051921 is a wasteful number, since it uses less digits than its factorization.

27051921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2142 (or 2136 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 27.

The square root of 27051921 is about 5201.1461236924. The cubic root of 27051921 is about 300.1921768672.

Adding to 27051921 its reverse (12915072), we get a palindrome (39966993).

It can be divided in two parts, 27051 and 921, that added together give a palindrome (27972).

The spelling of 27051921 in words is "twenty-seven million, fifty-one thousand, nine hundred twenty-one".