206453235021 has 32 divisors (see below), whose sum is σ = 306829233792. Its totient is φ = 122414223360.

The previous prime is 206453234951. The next prime is 206453235091. The reversal of 206453235021 is 120532354602.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (206453234951) and next prime (206453235091).

It is not a de Polignac number, because 206453235021 - 2¹³ = 206453226829 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206453235091) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 450201 + ... + 784593.

It is an arithmetic number, because the mean of its divisors is an integer number (9588413556).

Almost surely, 2^206453235021 is an apocalyptic number.

It is an amenable number.

206453235021 is a deficient number, since it is larger than the sum of its proper divisors (100375998771).

206453235021 is a wasteful number, since it uses less digits than its factorization.

206453235021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334813.

The product of its (nonzero) digits is 43200, while the sum is 33.

Adding to 206453235021 its reverse (120532354602), we get a palindrome (326985589623).

The spelling of 206453235021 in words is "two hundred six billion, four hundred fifty-three million, two hundred thirty-five thousand, twenty-one".