54699966621221 has 2 divisors, whose sum is σ = 54699966621222. Its totient is φ = 54699966621220.

The previous prime is 54699966621173. The next prime is 54699966621229. The reversal of 54699966621221 is 12212666999645.

54699966621221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52599641058721 + 2100325562500 = 7252561^2 + 1449250^2 .

It is a cyclic number.

It is not a de Polignac number, because 54699966621221 - 2¹⁴ = 54699966604837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (54699966621229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27349983310610 + 27349983310611.

It is an arithmetic number, because the mean of its divisors is an integer number (27349983310611).

Almost surely, 2^{54699966621221} is an apocalyptic number.

It is an amenable number.

54699966621221 is a deficient number, since it is larger than the sum of its proper divisors (1).

54699966621221 is an equidigital number, since it uses as much as digits as its factorization.

54699966621221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 151165440, while the sum is 68.

The spelling of 54699966621221 in words is "fifty-four trillion, six hundred ninety-nine billion, nine hundred sixty-six million, six hundred twenty-one thousand, two hundred twenty-one".