5205706421 has 2 divisors, whose sum is σ = 5205706422. Its totient is φ = 5205706420.

The previous prime is 5205706411. The next prime is 5205706433. The reversal of 5205706421 is 1246075025.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5039580100 + 166126321 = 70990^2 + 12889^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5205706421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5205706411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2602853210 + 2602853211.

It is an arithmetic number, because the mean of its divisors is an integer number (2602853211).

Almost surely, 2^5205706421 is an apocalyptic number.

It is an amenable number.

5205706421 is a deficient number, since it is larger than the sum of its proper divisors (1).

5205706421 is an equidigital number, since it uses as much as digits as its factorization.

5205706421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16800, while the sum is 32.

The square root of 5205706421 is about 72150.5815707677. The cubic root of 5205706421 is about 1733.1117129827. Note that the first 3 decimals are identical.

The spelling of 5205706421 in words is "five billion, two hundred five million, seven hundred six thousand, four hundred twenty-one".