240513421 has 12 divisors (see below), whose sum is σ = 249855732. Its totient is φ = 231360000.

The previous prime is 240513401. The next prime is 240513437. The reversal of 240513421 is 124315042.

It can be written as a sum of positive squares in 6 ways, for example, as 17757796 + 222755625 = 4214^2 + 14925^2 .

It is a de Polignac number, because none of the positive numbers 2^k-240513421 is a prime.

It is a super-2 number, since 2×240513421² = 115693411362246482, 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 = 240513392 and 240513401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (240513401) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 997861 + ... + 998101.

It is an arithmetic number, because the mean of its divisors is an integer number (20821311).

Almost surely, 2^240513421 is an apocalyptic number.

It is an amenable number.

240513421 is a deficient number, since it is larger than the sum of its proper divisors (9342311).

240513421 is an equidigital number, since it uses as much as digits as its factorization.

240513421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 624 (or 383 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 240513421 is about 15508.4951236411. The cubic root of 240513421 is about 621.8893295723.

Adding to 240513421 its reverse (124315042), we get a palindrome (364828463).

It can be divided in two parts, 24051 and 3421, that added together give a palindrome (27472).

The spelling of 240513421 in words is "two hundred forty million, five hundred thirteen thousand, four hundred twenty-one".