206070421 has 4 divisors (see below), whose sum is σ = 209563200. Its totient is φ = 202577644.

The previous prime is 206070377. The next prime is 206070443. The reversal of 206070421 is 124070602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206070421 is a prime.

It is a super-2 number, since 2×206070421² = 84930036822234482, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 206070392 and 206070401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206070451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1746301 + ... + 1746418.

It is an arithmetic number, because the mean of its divisors is an integer number (52390800).

Almost surely, 2^206070421 is an apocalyptic number.

It is an amenable number.

206070421 is a deficient number, since it is larger than the sum of its proper divisors (3492779).

206070421 is an equidigital number, since it uses as much as digits as its factorization.

206070421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3492778.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 206070421 is about 14355.1531165641. The cubic root of 206070421 is about 590.6613487927.

The spelling of 206070421 in words is "two hundred six million, seventy thousand, four hundred twenty-one".