55002011771921 has 2 divisors, whose sum is σ = 55002011771922. Its totient is φ = 55002011771920.

The previous prime is 55002011771867. The next prime is 55002011771947. The reversal of 55002011771921 is 12917711020055.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54873485936896 + 128525835025 = 7407664^2 + 358505^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55002011771921 is a prime.

It is not a weakly prime, because it can be changed into another prime (55002011771221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27501005885960 + 27501005885961.

It is an arithmetic number, because the mean of its divisors is an integer number (27501005885961).

Almost surely, 2^{55002011771921} is an apocalyptic number.

It is an amenable number.

55002011771921 is a deficient number, since it is larger than the sum of its proper divisors (1).

55002011771921 is an equidigital number, since it uses as much as digits as its factorization.

55002011771921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 44100, while the sum is 41.

Adding to 55002011771921 its reverse (12917711020055), we get a palindrome (67919722791976).

The spelling of 55002011771921 in words is "fifty-five trillion, two billion, eleven million, seven hundred seventy-one thousand, nine hundred twenty-one".