55256921 has 8 divisors (see below), whose sum is σ = 58334400. Its totient is φ = 52196400.

The previous prime is 55256881. The next prime is 55256933. The reversal of 55256921 is 12965255.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 55256921 - 2⁶ = 55256857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55256951) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2771 + ... + 10871.

It is an arithmetic number, because the mean of its divisors is an integer number (7291800).

Almost surely, 2^55256921 is an apocalyptic number.

It is an amenable number.

55256921 is a deficient number, since it is larger than the sum of its proper divisors (3077479).

55256921 is a wasteful number, since it uses less digits than its factorization.

55256921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8479.

The product of its digits is 27000, while the sum is 35.

The square root of 55256921 is about 7433.4999159212. The cubic root of 55256921 is about 380.8864829916.

The spelling of 55256921 in words is "fifty-five million, two hundred fifty-six thousand, nine hundred twenty-one".