55302121 has 4 divisors (see below), whose sum is σ = 63202432. Its totient is φ = 47401812.

The previous prime is 55302119. The next prime is 55302167. The reversal of 55302121 is 12120355.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 55302121 - 2¹ = 55302119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55300121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3950145 + ... + 3950158.

It is an arithmetic number, because the mean of its divisors is an integer number (15800608).

Almost surely, 2^55302121 is an apocalyptic number.

It is an amenable number.

55302121 is a deficient number, since it is larger than the sum of its proper divisors (7900311).

55302121 is an equidigital number, since it uses as much as digits as its factorization.

55302121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7900310.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 55302121 is about 7436.5395850489. The cubic root of 55302121 is about 380.9903093638.

Adding to 55302121 its reverse (12120355), we get a palindrome (67422476).

The spelling of 55302121 in words is "fifty-five million, three hundred two thousand, one hundred twenty-one".