206213688621 has 48 divisors (see below), whose sum is σ = 318012552000. Its totient is φ = 132058600128.

The previous prime is 206213688559. The next prime is 206213688647. The reversal of 206213688621 is 126886312602.

206213688621 is a `hidden beast` number, since 2 + 0 + 6 + 2 + 13 + 6 + 8 + 8 + 621 = 666.

It is not a de Polignac number, because 206213688621 - 2⁶ = 206213688557 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206213686621) 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, 4450230 + ... + 4496328.

It is an arithmetic number, because the mean of its divisors is an integer number (6625261500).

Almost surely, 2^206213688621 is an apocalyptic number.

It is an amenable number.

206213688621 is a deficient number, since it is larger than the sum of its proper divisors (111798863379).

206213688621 is a wasteful number, since it uses less digits than its factorization.

206213688621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46363 (or 46328 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 45.

The spelling of 206213688621 in words is "two hundred six billion, two hundred thirteen million, six hundred eighty-eight thousand, six hundred twenty-one".