206124055211221 has 8 divisors (see below), whose sum is σ = 235571506214144. Its totient is φ = 176676893558640.

The previous prime is 206124055211183. The next prime is 206124055211231. The reversal of 206124055211221 is 122112550421602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206124055211221 is a prime.

It is a super-2 number, since 2×206124055211221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206124055211231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70808925 + ... + 73662418.

It is an arithmetic number, because the mean of its divisors is an integer number (29446438276768).

Almost surely, 2^{206124055211221} is an apocalyptic number.

It is an amenable number.

206124055211221 is a deficient number, since it is larger than the sum of its proper divisors (29447451002923).

206124055211221 is a wasteful number, since it uses less digits than its factorization.

206124055211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144675171.

The product of its (nonzero) digits is 19200, while the sum is 34.

The spelling of 206124055211221 in words is "two hundred six trillion, one hundred twenty-four billion, fifty-five million, two hundred eleven thousand, two hundred twenty-one".