101243521 has 2 divisors, whose sum is σ = 101243522. Its totient is φ = 101243520.

The previous prime is 101243501. The next prime is 101243531. The reversal of 101243521 is 125342101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56085121 + 45158400 = 7489^2 + 6720^2 .

It is an emirp because it is prime and its reverse (125342101) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 101243521 - 2¹¹ = 101241473 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (101243501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50621760 + 50621761.

It is an arithmetic number, because the mean of its divisors is an integer number (50621761).

Almost surely, 2^101243521 is an apocalyptic number.

It is an amenable number.

101243521 is a deficient number, since it is larger than the sum of its proper divisors (1).

101243521 is an equidigital number, since it uses as much as digits as its factorization.

101243521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 101243521 is about 10061.9839495002. The cubic root of 101243521 is about 466.0749340714.

Adding to 101243521 its reverse (125342101), we get a palindrome (226585622).

The spelling of 101243521 in words is "one hundred one million, two hundred forty-three thousand, five hundred twenty-one".