240216621 has 8 divisors (see below), whose sum is σ = 321700704. Its totient is φ = 159438480.

The previous prime is 240216589. The next prime is 240216631. The reversal of 240216621 is 126612042.

240216621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 240216621 - 2⁵ = 240216589 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 240216591 and 240216600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (240216631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 175690 + ... + 177051.

It is an arithmetic number, because the mean of its divisors is an integer number (40212588).

Almost surely, 2^240216621 is an apocalyptic number.

It is an amenable number.

240216621 is a deficient number, since it is larger than the sum of its proper divisors (81484083).

240216621 is a wasteful number, since it uses less digits than its factorization.

240216621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352971.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 240216621 is about 15498.9232206628. The cubic root of 240216621 is about 621.6334149147.

Adding to 240216621 its reverse (126612042), we get a palindrome (366828663).

The spelling of 240216621 in words is "two hundred forty million, two hundred sixteen thousand, six hundred twenty-one".