206214021 has 24 divisors (see below), whose sum is σ = 334728576. Its totient is φ = 121381920.

The previous prime is 206214017. The next prime is 206214037. The reversal of 206214021 is 120412602.

206214021 is a `hidden beast` number, since 2 + 0 + 621 + 40 + 2 + 1 = 666.

It is not a de Polignac number, because 206214021 - 2² = 206214017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 206213985 and 206214003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206214721) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 35625 + ... + 41006.

It is an arithmetic number, because the mean of its divisors is an integer number (13947024).

Almost surely, 2^206214021 is an apocalyptic number.

It is an amenable number.

206214021 is a deficient number, since it is larger than the sum of its proper divisors (128514555).

206214021 is a wasteful number, since it uses less digits than its factorization.

206214021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76673 (or 76670 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 206214021 is about 14360.1539337153. The cubic root of 206214021 is about 590.7985175574.

Adding to 206214021 its reverse (120412602), we get a palindrome (326626623).

It can be divided in two parts, 20621 and 4021, that added together give a palindrome (24642).

The spelling of 206214021 in words is "two hundred six million, two hundred fourteen thousand, twenty-one".