55301021 has 2 divisors, whose sum is σ = 55301022. Its totient is φ = 55301020.

The previous prime is 55300979. The next prime is 55301047. The reversal of 55301021 is 12010355.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38613796 + 16687225 = 6214^2 + 4085^2 .

It is a cyclic number.

It is not a de Polignac number, because 55301021 - 2¹⁴ = 55284637 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55301321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27650510 + 27650511.

It is an arithmetic number, because the mean of its divisors is an integer number (27650511).

Almost surely, 2^55301021 is an apocalyptic number.

It is an amenable number.

55301021 is a deficient number, since it is larger than the sum of its proper divisors (1).

55301021 is an equidigital number, since it uses as much as digits as its factorization.

55301021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 150, while the sum is 17.

The square root of 55301021 is about 7436.4656255509. The cubic root of 55301021 is about 380.9877832875.

Adding to 55301021 its reverse (12010355), we get a palindrome (67311376).

The spelling of 55301021 in words is "fifty-five million, three hundred one thousand, twenty-one".