206633454021 has 48 divisors (see below), whose sum is σ = 312587358720. Its totient is φ = 131377697280.

The previous prime is 206633453989. The next prime is 206633454029. The reversal of 206633454021 is 120454336602.

206633454021 is a `hidden beast` number, since 2 + 0 + 6 + 63 + 34 + 540 + 21 = 666.

It is not a de Polignac number, because 206633454021 - 2⁵ = 206633453989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206633454029) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9460305 + ... + 9482121.

It is an arithmetic number, because the mean of its divisors is an integer number (6512236640).

Almost surely, 2^206633454021 is an apocalyptic number.

It is an amenable number.

206633454021 is a deficient number, since it is larger than the sum of its proper divisors (105953904699).

206633454021 is a wasteful number, since it uses less digits than its factorization.

206633454021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22346 (or 22343 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 36.

The spelling of 206633454021 in words is "two hundred six billion, six hundred thirty-three million, four hundred fifty-four thousand, twenty-one".