207421 has 4 divisors (see below), whose sum is σ = 214144. Its totient is φ = 200700.

The previous prime is 207409. The next prime is 207433. The reversal of 207421 is 124702.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 124702 = 2 ⋅62351.

It is an interprime number because it is at equal distance from previous prime (207409) and next prime (207433).

It is a cyclic number.

It is not a de Polignac number, because 207421 - 2⁷ = 207293 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 207395 and 207404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (207401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3315 + ... + 3376.

It is an arithmetic number, because the mean of its divisors is an integer number (53536).

2²⁰⁷⁴²¹ is an apocalyptic number.

It is an amenable number.

207421 is a deficient number, since it is larger than the sum of its proper divisors (6723).

207421 is an equidigital number, since it uses as much as digits as its factorization.

207421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6722.

The product of its (nonzero) digits is 112, while the sum is 16.

The square root of 207421 is about 455.4349569368. The cubic root of 207421 is about 59.1948931862.

The spelling of 207421 in words is "two hundred seven thousand, four hundred twenty-one", and thus it is an iban number.