55353921 has 32 divisors (see below), whose sum is σ = 91238400. Its totient is φ = 29127936.

The previous prime is 55353917. The next prime is 55353967. The reversal of 55353921 is 12935355.

It is not a de Polignac number, because 55353921 - 2² = 55353917 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55353911) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15130 + ... + 18428.

It is an arithmetic number, because the mean of its divisors is an integer number (2851200).

Almost surely, 2^55353921 is an apocalyptic number.

55353921 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

55353921 is a deficient number, since it is larger than the sum of its proper divisors (35884479).

55353921 is a wasteful number, since it uses less digits than its factorization.

55353921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3373.

The product of its digits is 20250, while the sum is 33.

The square root of 55353921 is about 7440.0215725494. The cubic root of 55353921 is about 381.1092266797.

The spelling of 55353921 in words is "fifty-five million, three hundred fifty-three thousand, nine hundred twenty-one".