2206867715821 has 2 divisors, whose sum is σ = 2206867715822. Its totient is φ = 2206867715820.

The previous prime is 2206867715807. The next prime is 2206867715827. The reversal of 2206867715821 is 1285177686022.

2206867715821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2131235015625 + 75632700196 = 1459875^2 + 275014^2 .

It is a cyclic number.

It is not a de Polignac number, because 2206867715821 - 2²¹ = 2206865618669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2206867715827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1103433857910 + 1103433857911.

It is an arithmetic number, because the mean of its divisors is an integer number (1103433857911).

Almost surely, 2^{2206867715821} is an apocalyptic number.

It is an amenable number.

2206867715821 is a deficient number, since it is larger than the sum of its proper divisors (1).

2206867715821 is an equidigital number, since it uses as much as digits as its factorization.

2206867715821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4515840, while the sum is 55.

The spelling of 2206867715821 in words is "two trillion, two hundred six billion, eight hundred sixty-seven million, seven hundred fifteen thousand, eight hundred twenty-one".