240455021 has 4 divisors (see below), whose sum is σ = 254599452. Its totient is φ = 226310592.

The previous prime is 240455009. The next prime is 240455023. The reversal of 240455021 is 120554042.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 71740900 + 168714121 = 8470^2 + 12989^2 .

It is a cyclic number.

It is not a de Polignac number, because 240455021 - 2⁶ = 240454957 is a prime.

It is a super-2 number, since 2×240455021² = 115637234248220882, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (240455023) 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, 7072190 + ... + 7072223.

It is an arithmetic number, because the mean of its divisors is an integer number (63649863).

Almost surely, 2^240455021 is an apocalyptic number.

It is an amenable number.

240455021 is a deficient number, since it is larger than the sum of its proper divisors (14144431).

240455021 is a wasteful number, since it uses less digits than its factorization.

240455021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14144430.

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 240455021 is about 15506.6121702969. The cubic root of 240455021 is about 621.8389910414.

The spelling of 240455021 in words is "two hundred forty million, four hundred fifty-five thousand, twenty-one".