240020521 has 16 divisors (see below), whose sum is σ = 272643840. Its totient is φ = 209468160.

The previous prime is 240020509. The next prime is 240020533. The reversal of 240020521 is 125020042.

240020521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (240020509) and next prime (240020533).

It is not a de Polignac number, because 240020521 - 2⁵ = 240020489 is a prime.

It is a super-2 number, since 2×240020521² = 115219701002222882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 240020495 and 240020504.

It is not an unprimeable number, because it can be changed into a prime (240020551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 217056 + ... + 218158.

It is an arithmetic number, because the mean of its divisors is an integer number (17040240).

Almost surely, 2^240020521 is an apocalyptic number.

It is an amenable number.

240020521 is a deficient number, since it is larger than the sum of its proper divisors (32623319).

240020521 is a wasteful number, since it uses less digits than its factorization.

240020521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2016.

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 240020521 is about 15492.5956830997. The cubic root of 240020521 is about 621.4642127744.

Adding to 240020521 its reverse (125020042), we get a palindrome (365040563).

The spelling of 240020521 in words is "two hundred forty million, twenty thousand, five hundred twenty-one".