206121020701 has 4 divisors (see below), whose sum is σ = 207744020992. Its totient is φ = 204498020412.

The previous prime is 206121020683. The next prime is 206121020767. The reversal of 206121020701 is 107020121602.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 206121020701 - 2¹⁷ = 206120889629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206121020101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 811499955 + ... + 811500208.

It is an arithmetic number, because the mean of its divisors is an integer number (51936005248).

Almost surely, 2^206121020701 is an apocalyptic number.

It is an amenable number.

206121020701 is a deficient number, since it is larger than the sum of its proper divisors (1623000291).

206121020701 is a wasteful number, since it uses less digits than its factorization.

206121020701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1623000290.

The product of its (nonzero) digits is 336, while the sum is 22.

The spelling of 206121020701 in words is "two hundred six billion, one hundred twenty-one million, twenty thousand, seven hundred one".