53501500021 has 2 divisors, whose sum is σ = 53501500022. Its totient is φ = 53501500020.

The previous prime is 53501499991. The next prime is 53501500043. The reversal of 53501500021 is 12000510535.

53501500021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (53501500043) can be obtained adding 53501500021 to its sum of digits (22).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38412080100 + 15089419921 = 195990^2 + 122839^2 .

It is a cyclic number.

It is not a de Polignac number, because 53501500021 - 2²⁵ = 53467945589 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 53501499965 and 53501500001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53501500081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26750750010 + 26750750011.

It is an arithmetic number, because the mean of its divisors is an integer number (26750750011).

Almost surely, 2^53501500021 is an apocalyptic number.

It is an amenable number.

53501500021 is a deficient number, since it is larger than the sum of its proper divisors (1).

53501500021 is an equidigital number, since it uses as much as digits as its factorization.

53501500021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 750, while the sum is 22.

The spelling of 53501500021 in words is "fifty-three billion, five hundred one million, five hundred thousand, twenty-one".