55505110021 has 2 divisors, whose sum is σ = 55505110022. Its totient is φ = 55505110020.

The previous prime is 55505109943. The next prime is 55505110099. The reversal of 55505110021 is 12001150555.

It is a balanced prime because it is at equal distance from previous prime (55505109943) and next prime (55505110099).

It can be written as a sum of positive squares in only one way, i.e., 45721130625 + 9783979396 = 213825^2 + 98914^2 .

It is a cyclic number.

It is not a de Polignac number, because 55505110021 - 2¹³ = 55505101829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55505117021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27752555010 + 27752555011.

It is an arithmetic number, because the mean of its divisors is an integer number (27752555011).

Almost surely, 2^55505110021 is an apocalyptic number.

It is an amenable number.

55505110021 is a deficient number, since it is larger than the sum of its proper divisors (1).

55505110021 is an equidigital number, since it uses as much as digits as its factorization.

55505110021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1250, while the sum is 25.

Adding to 55505110021 its reverse (12001150555), we get a palindrome (67506260576).

The spelling of 55505110021 in words is "fifty-five billion, five hundred five million, one hundred ten thousand, twenty-one".