2181206047 has 2 divisors, whose sum is σ = 2181206048. Its totient is φ = 2181206046.

The previous prime is 2181206011. The next prime is 2181206051. The reversal of 2181206047 is 7406021812.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2181206047 - 2⁷ = 2181205919 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2181216047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1090603023 + 1090603024.

It is an arithmetic number, because the mean of its divisors is an integer number (1090603024).

Almost surely, 2^2181206047 is an apocalyptic number.

2181206047 is a deficient number, since it is larger than the sum of its proper divisors (1).

2181206047 is an equidigital number, since it uses as much as digits as its factorization.

2181206047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 2181206047 is about 46703.3836782732. The cubic root of 2181206047 is about 1296.8773270637.

Adding to 2181206047 its reverse (7406021812), we get a palindrome (9587227859).

The spelling of 2181206047 in words is "two billion, one hundred eighty-one million, two hundred six thousand, forty-seven".