340320021 has 8 divisors (see below), whose sum is σ = 455061600. Its totient is φ = 226229232.

The previous prime is 340320007. The next prime is 340320031. The reversal of 340320021 is 120023043.

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

It is not a de Polignac number, because 340320021 - 2⁷ = 340319893 is a prime.

It is a super-3 number, since 3×340320021³ (a number of 27 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (340320031) 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, 161475 + ... + 163568.

It is an arithmetic number, because the mean of its divisors is an integer number (56882700).

Almost surely, 2^340320021 is an apocalyptic number.

It is an amenable number.

340320021 is a deficient number, since it is larger than the sum of its proper divisors (114741579).

340320021 is a wasteful number, since it uses less digits than its factorization.

340320021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325395.

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 340320021 is about 18447.7646613350. The cubic root of 340320021 is about 698.1721161036.

Adding to 340320021 its reverse (120023043), we get a palindrome (460343064).

The spelling of 340320021 in words is "three hundred forty million, three hundred twenty thousand, twenty-one".