340240221 has 24 divisors (see below), whose sum is σ = 509044224. Its totient is φ = 218760480.

The previous prime is 340240217. The next prime is 340240223. The reversal of 340240221 is 122042043.

340240221 is a `hidden beast` number, since 3 + 402 + 40 + 221 = 666.

It is not a de Polignac number, because 340240221 - 2² = 340240217 is a prime.

It is a super-2 number, since 2×340240221² = 231526815972257682, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 340240194 and 340240203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (340240223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 86520 + ... + 90366.

It is an arithmetic number, because the mean of its divisors is an integer number (21210176).

Almost surely, 2^340240221 is an apocalyptic number.

340240221 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

340240221 is a deficient number, since it is larger than the sum of its proper divisors (168804003).

340240221 is a wasteful number, since it uses less digits than its factorization.

340240221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4201 (or 4198 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 340240221 is about 18445.6016708591. The cubic root of 340240221 is about 698.1175415005.

Adding to 340240221 its reverse (122042043), we get a palindrome (462282264).

The spelling of 340240221 in words is "three hundred forty million, two hundred forty thousand, two hundred twenty-one".