53021355344721 has 6 divisors (see below), whose sum is σ = 76586402164610. Its totient is φ = 35347570229808.

The previous prime is 53021355344693. The next prime is 53021355344731. The reversal of 53021355344721 is 12744355312035.

It is a happy number.

53021355344721 is a `hidden beast` number, since 5 + 3 + 0 + 2 + 135 + 53 + 447 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 47462606054721 + 5558749290000 = 6889311^2 + 2357700^2 .

It is not a de Polignac number, because 53021355344721 - 2¹⁷ = 53021355213649 is a prime.

It is a super-2 number, since 2×53021355344721² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53021355344731) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2945630852476 + ... + 2945630852493.

Almost surely, 2^{53021355344721} is an apocalyptic number.

It is an amenable number.

53021355344721 is a deficient number, since it is larger than the sum of its proper divisors (23565046819889).

53021355344721 is a wasteful number, since it uses less digits than its factorization.

53021355344721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5891261704975 (or 5891261704972 counting only the distinct ones).

The product of its (nonzero) digits is 1512000, while the sum is 45.

The spelling of 53021355344721 in words is "fifty-three trillion, twenty-one billion, three hundred fifty-five million, three hundred forty-four thousand, seven hundred twenty-one".