260206421 has 2 divisors, whose sum is σ = 260206422. Its totient is φ = 260206420.

The previous prime is 260206417. The next prime is 260206439. The reversal of 260206421 is 124602062.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 259371025 + 835396 = 16105^2 + 914^2 .

It is a cyclic number.

It is not a de Polignac number, because 260206421 - 2² = 260206417 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 (260206451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130103210 + 130103211.

It is an arithmetic number, because the mean of its divisors is an integer number (130103211).

Almost surely, 2^260206421 is an apocalyptic number.

It is an amenable number.

260206421 is a deficient number, since it is larger than the sum of its proper divisors (1).

260206421 is an equidigital number, since it uses as much as digits as its factorization.

260206421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 260206421 is about 16130.9150701378. The cubic root of 260206421 is about 638.4192932721.

Adding to 260206421 its reverse (124602062), we get a palindrome (384808483).

The spelling of 260206421 in words is "two hundred sixty million, two hundred six thousand, four hundred twenty-one".