54247921 has 16 divisors (see below), whose sum is σ = 67005568. Its totient is φ = 42768000.

The previous prime is 54247873. The next prime is 54247927. The reversal of 54247921 is 12974245.

It is a cyclic number.

It is not a de Polignac number, because 54247921 - 2¹³ = 54239729 is a prime.

It is not an unprimeable number, because it can be changed into a prime (54247927) 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, 29221 + ... + 31021.

It is an arithmetic number, because the mean of its divisors is an integer number (4187848).

Almost surely, 2^54247921 is an apocalyptic number.

It is an amenable number.

54247921 is a deficient number, since it is larger than the sum of its proper divisors (12757647).

54247921 is a wasteful number, since it uses less digits than its factorization.

54247921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2152.

The product of its digits is 20160, while the sum is 34.

The square root of 54247921 is about 7365.3187982599. The cubic root of 54247921 is about 378.5538780655.

The spelling of 54247921 in words is "fifty-four million, two hundred forty-seven thousand, nine hundred twenty-one".