217920406147 has 2 divisors, whose sum is σ = 217920406148. Its totient is φ = 217920406146.

The previous prime is 217920406061. The next prime is 217920406153. The reversal of 217920406147 is 741604029712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 217920406147 - 2²³ = 217912017539 is a prime.

It is not a weakly prime, because it can be changed into another prime (217920406247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108960203073 + 108960203074.

It is an arithmetic number, because the mean of its divisors is an integer number (108960203074).

Almost surely, 2^217920406147 is an apocalyptic number.

217920406147 is a deficient number, since it is larger than the sum of its proper divisors (1).

217920406147 is an equidigital number, since it uses as much as digits as its factorization.

217920406147 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 169344, while the sum is 43.

The spelling of 217920406147 in words is "two hundred seventeen billion, nine hundred twenty million, four hundred six thousand, one hundred forty-seven".