53457120388421 has 2 divisors, whose sum is σ = 53457120388422. Its totient is φ = 53457120388420.

The previous prime is 53457120388411. The next prime is 53457120388423. The reversal of 53457120388421 is 12488302175435.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32010135062500 + 21446985325921 = 5657750^2 + 4631089^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-53457120388421 is a prime.

It is a Sophie Germain prime.

Together with 53457120388423, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53457120388423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26728560194210 + 26728560194211.

It is an arithmetic number, because the mean of its divisors is an integer number (26728560194211).

Almost surely, 2^{53457120388421} is an apocalyptic number.

It is an amenable number.

53457120388421 is a deficient number, since it is larger than the sum of its proper divisors (1).

53457120388421 is an equidigital number, since it uses as much as digits as its factorization.

53457120388421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6451200, while the sum is 53.

The spelling of 53457120388421 in words is "fifty-three trillion, four hundred fifty-seven billion, one hundred twenty million, three hundred eighty-eight thousand, four hundred twenty-one".