21750241537 has 2 divisors, whose sum is σ = 21750241538. Its totient is φ = 21750241536.

The previous prime is 21750241511. The next prime is 21750241547. The reversal of 21750241537 is 73514205712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18442726416 + 3307515121 = 135804^2 + 57511^2 .

It is a cyclic number.

It is not a de Polignac number, because 21750241537 - 2¹⁵ = 21750208769 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21750241496 and 21750241505.

It is not a weakly prime, because it can be changed into another prime (21750241547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10875120768 + 10875120769.

It is an arithmetic number, because the mean of its divisors is an integer number (10875120769).

Almost surely, 2^21750241537 is an apocalyptic number.

It is an amenable number.

21750241537 is a deficient number, since it is larger than the sum of its proper divisors (1).

21750241537 is an equidigital number, since it uses as much as digits as its factorization.

21750241537 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 58800, while the sum is 37.

The spelling of 21750241537 in words is "twenty-one billion, seven hundred fifty million, two hundred forty-one thousand, five hundred thirty-seven".