207340021 has 6 divisors (see below), whose sum is σ = 241191510. Its totient is φ = 177719976.

The previous prime is 207340013. The next prime is 207340031. The reversal of 207340021 is 120043702.

It can be written as a sum of positive squares in only one way, i.e., 183467025 + 23872996 = 13545^2 + 4886^2 .

It is not a de Polignac number, because 207340021 - 2³ = 207340013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (207340031) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2115666 + ... + 2115763.

It is an arithmetic number, because the mean of its divisors is an integer number (40198585).

Almost surely, 2^207340021 is an apocalyptic number.

It is an amenable number.

207340021 is a deficient number, since it is larger than the sum of its proper divisors (33851489).

207340021 is an equidigital number, since it uses as much as digits as its factorization.

207340021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4231443 (or 4231436 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 19.

The square root of 207340021 is about 14399.3062680117. The cubic root of 207340021 is about 591.8718877955.

Adding to 207340021 its reverse (120043702), we get a palindrome (327383723).

The spelling of 207340021 in words is "two hundred seven million, three hundred forty thousand, twenty-one".