206127421 has 2 divisors, whose sum is σ = 206127422. Its totient is φ = 206127420.

The previous prime is 206127367. The next prime is 206127433. The reversal of 206127421 is 124721602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 185096025 + 21031396 = 13605^2 + 4586^2 .

It is a cyclic number.

It is not a de Polignac number, because 206127421 - 2⁹ = 206126909 is a prime.

It is a super-2 number, since 2×206127421² = 84977027376222482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206127461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103063710 + 103063711.

It is an arithmetic number, because the mean of its divisors is an integer number (103063711).

Almost surely, 2^206127421 is an apocalyptic number.

It is an amenable number.

206127421 is a deficient number, since it is larger than the sum of its proper divisors (1).

206127421 is an equidigital number, since it uses as much as digits as its factorization.

206127421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 206127421 is about 14357.1383290682. The cubic root of 206127421 is about 590.7158036290.

The spelling of 206127421 in words is "two hundred six million, one hundred twenty-seven thousand, four hundred twenty-one".