207205421 has 2 divisors, whose sum is σ = 207205422. Its totient is φ = 207205420.

The previous prime is 207205391. The next prime is 207205429. The reversal of 207205421 is 124502702.

It is a happy number.

207205421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 195720100 + 11485321 = 13990^2 + 3389^2 .

It is a cyclic number.

It is not a de Polignac number, because 207205421 - 2⁶ = 207205357 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (207205429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103602710 + 103602711.

It is an arithmetic number, because the mean of its divisors is an integer number (103602711).

Almost surely, 2^207205421 is an apocalyptic number.

It is an amenable number.

207205421 is a deficient number, since it is larger than the sum of its proper divisors (1).

207205421 is an equidigital number, since it uses as much as digits as its factorization.

207205421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1120, while the sum is 23.

The square root of 207205421 is about 14394.6316729536. The cubic root of 207205421 is about 591.7437838868.

The spelling of 207205421 in words is "two hundred seven million, two hundred five thousand, four hundred twenty-one".