240213421 has 4 divisors (see below), whose sum is σ = 274529632. Its totient is φ = 205897212.

The previous prime is 240213353. The next prime is 240213427. The reversal of 240213421 is 124312042.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 240213421 - 2⁹ = 240212909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (240213427) 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, 17158095 + ... + 17158108.

It is an arithmetic number, because the mean of its divisors is an integer number (68632408).

Almost surely, 2^240213421 is an apocalyptic number.

It is an amenable number.

240213421 is a deficient number, since it is larger than the sum of its proper divisors (34316211).

240213421 is an equidigital number, since it uses as much as digits as its factorization.

240213421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34316210.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 240213421 is about 15498.8199873410. The cubic root of 240213421 is about 621.6306545787.

Adding to 240213421 its reverse (124312042), we get a palindrome (364525463).

The spelling of 240213421 in words is "two hundred forty million, two hundred thirteen thousand, four hundred twenty-one".