340021321 has 8 divisors (see below), whose sum is σ = 358181600. Its totient is φ = 321887520.

The previous prime is 340021303. The next prime is 340021333. The reversal of 340021321 is 123120043.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 340021321 - 2¹³ = 340013129 is a prime.

It is a super-2 number, since 2×340021321² = 231228997469170082, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 340021295 and 340021304.

It is not an unprimeable number, because it can be changed into a prime (340025321) 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, 23245 + ... + 34933.

It is an arithmetic number, because the mean of its divisors is an integer number (44772700).

Almost surely, 2^340021321 is an apocalyptic number.

It is an amenable number.

340021321 is a deficient number, since it is larger than the sum of its proper divisors (18160279).

340021321 is a wasteful number, since it uses less digits than its factorization.

340021321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13239.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 340021321 is about 18439.6670523087. The cubic root of 340021321 is about 697.9677936607.

Adding to 340021321 its reverse (123120043), we get a palindrome (463141364).

The spelling of 340021321 in words is "three hundred forty million, twenty-one thousand, three hundred twenty-one".