55060021 has 2 divisors, whose sum is σ = 55060022. Its totient is φ = 55060020.

The previous prime is 55059973. The next prime is 55060037. The reversal of 55060021 is 12006055.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52403121 + 2656900 = 7239^2 + 1630^2 .

It is a cyclic number.

It is not a de Polignac number, because 55060021 - 2¹⁵ = 55027253 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 (55060051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27530010 + 27530011.

It is an arithmetic number, because the mean of its divisors is an integer number (27530011).

Almost surely, 2^55060021 is an apocalyptic number.

It is an amenable number.

55060021 is a deficient number, since it is larger than the sum of its proper divisors (1).

55060021 is an equidigital number, since it uses as much as digits as its factorization.

55060021 is an odious number, because the sum of its binary digits is odd.

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

The square root of 55060021 is about 7420.2439986836. The cubic root of 55060021 is about 380.4335333660.

Adding to 55060021 its reverse (12006055), we get a palindrome (67066076).

The spelling of 55060021 in words is "fifty-five million, sixty thousand, twenty-one".