240400340421 has 16 divisors (see below), whose sum is σ = 331040360448. Its totient is φ = 155018818800.

The previous prime is 240400340333. The next prime is 240400340423. The reversal of 240400340421 is 124043004042.

It is a happy number.

It is not a de Polignac number, because 240400340421 - 2¹⁰ = 240400339397 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 240400340391 and 240400340400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (240400340423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 465675 + ... + 835256.

It is an arithmetic number, because the mean of its divisors is an integer number (20690022528).

Almost surely, 2^240400340421 is an apocalyptic number.

It is an amenable number.

240400340421 is a deficient number, since it is larger than the sum of its proper divisors (90640020027).

240400340421 is a wasteful number, since it uses less digits than its factorization.

240400340421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1302952.

The product of its (nonzero) digits is 3072, while the sum is 24.

Adding to 240400340421 its reverse (124043004042), we get a palindrome (364443344463).

The spelling of 240400340421 in words is "two hundred forty billion, four hundred million, three hundred forty thousand, four hundred twenty-one".