53545420021 has 2 divisors, whose sum is σ = 53545420022. Its totient is φ = 53545420020.

The previous prime is 53545420007. The next prime is 53545420063. The reversal of 53545420021 is 12002454535.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51922458225 + 1622961796 = 227865^2 + 40286^2 .

It is a cyclic number.

It is not a de Polignac number, because 53545420021 - 2²³ = 53537031413 is a prime.

It is a super-2 number, since 2×53545420021² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53545420001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26772710010 + 26772710011.

It is an arithmetic number, because the mean of its divisors is an integer number (26772710011).

Almost surely, 2^53545420021 is an apocalyptic number.

It is an amenable number.

53545420021 is a deficient number, since it is larger than the sum of its proper divisors (1).

53545420021 is an equidigital number, since it uses as much as digits as its factorization.

53545420021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24000, while the sum is 31.

Adding to 53545420021 its reverse (12002454535), we get a palindrome (65547874556).

The spelling of 53545420021 in words is "fifty-three billion, five hundred forty-five million, four hundred twenty thousand, twenty-one".