206106227721 has 12 divisors (see below), whose sum is σ = 307312512000. Its totient is φ = 132971759640.

The previous prime is 206106227681. The next prime is 206106227749. The reversal of 206106227721 is 127722601602.

It is a happy number.

206106227721 is a `hidden beast` number, since 2 + 0 + 6 + 1 + 0 + 622 + 7 + 7 + 21 = 666.

It is not a de Polignac number, because 206106227721 - 2¹¹ = 206106225673 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (206106220721) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 369365721 + ... + 369366278.

It is an arithmetic number, because the mean of its divisors is an integer number (25609376000).

Almost surely, 2^206106227721 is an apocalyptic number.

It is an amenable number.

206106227721 is a deficient number, since it is larger than the sum of its proper divisors (101206284279).

206106227721 is a wasteful number, since it uses less digits than its factorization.

206106227721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 738732036 (or 738732033 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

The spelling of 206106227721 in words is "two hundred six billion, one hundred six million, two hundred twenty-seven thousand, seven hundred twenty-one".