101240521 has 4 divisors (see below), whose sum is σ = 103709844. Its totient is φ = 98771200.

The previous prime is 101240509. The next prime is 101240527. The reversal of 101240521 is 125042101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 125042101 = 461 ⋅271241.

It can be written as a sum of positive squares in 2 ways, for example, as 30680521 + 70560000 = 5539^2 + 8400^2 .

It is a cyclic number.

It is not a de Polignac number, because 101240521 - 2⁷ = 101240393 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 101240495 and 101240504.

It is not an unprimeable number, because it can be changed into a prime (101240527) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1234600 + ... + 1234681.

It is an arithmetic number, because the mean of its divisors is an integer number (25927461).

Almost surely, 2^101240521 is an apocalyptic number.

It is an amenable number.

101240521 is a deficient number, since it is larger than the sum of its proper divisors (2469323).

101240521 is an equidigital number, since it uses as much as digits as its factorization.

101240521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2469322.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 101240521 is about 10061.8348724276. The cubic root of 101240521 is about 466.0703305222.

Adding to 101240521 its reverse (125042101), we get a palindrome (226282622).

It can be divided in two parts, 101240 and 521, that added together give a square (101761 = 319²).

The spelling of 101240521 in words is "one hundred one million, two hundred forty thousand, five hundred twenty-one".