53021997607421 has 2 divisors, whose sum is σ = 53021997607422. Its totient is φ = 53021997607420.

The previous prime is 53021997607279. The next prime is 53021997607451. The reversal of 53021997607421 is 12470679912035.

It is a happy number.

53021997607421 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., 49235622576100 + 3786375031321 = 7016810^2 + 1945861^2 .

It is a cyclic number.

It is not a de Polignac number, because 53021997607421 - 2²⁶ = 53021930498557 is a prime.

It is a super-2 number, since 2×53021997607421² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53021997607451) 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, 26510998803710 + 26510998803711.

It is an arithmetic number, because the mean of its divisors is an integer number (26510998803711).

Almost surely, 2^{53021997607421} is an apocalyptic number.

It is an amenable number.

53021997607421 is a deficient number, since it is larger than the sum of its proper divisors (1).

53021997607421 is an equidigital number, since it uses as much as digits as its factorization.

53021997607421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5715360, while the sum is 56.

The spelling of 53021997607421 in words is "fifty-three trillion, twenty-one billion, nine hundred ninety-seven million, six hundred seven thousand, four hundred twenty-one".