207742421 has 2 divisors, whose sum is σ = 207742422. Its totient is φ = 207742420.

The previous prime is 207742391. The next prime is 207742453. The reversal of 207742421 is 124247702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 164839921 + 42902500 = 12839^2 + 6550^2 .

It is a cyclic number.

It is not a de Polignac number, because 207742421 - 2⁶ = 207742357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (207742321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103871210 + 103871211.

It is an arithmetic number, because the mean of its divisors is an integer number (103871211).

Almost surely, 2^207742421 is an apocalyptic number.

It is an amenable number.

207742421 is a deficient number, since it is larger than the sum of its proper divisors (1).

207742421 is an equidigital number, since it uses as much as digits as its factorization.

207742421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6272, while the sum is 29.

The square root of 207742421 is about 14413.2723904046. The cubic root of 207742421 is about 592.2545367649.

The spelling of 207742421 in words is "two hundred seven million, seven hundred forty-two thousand, four hundred twenty-one".