217428731326 has 32 divisors (see below), whose sum is σ = 338311352160. Its totient is φ = 104718427776.

The previous prime is 217428731309. The next prime is 217428731339. The reversal of 217428731326 is 623137824712.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13206916 + ... + 13223368.

It is an arithmetic number, because the mean of its divisors is an integer number (10572229755).

Almost surely, 2^217428731326 is an apocalyptic number.

217428731326 is a deficient number, since it is larger than the sum of its proper divisors (120882620834).

217428731326 is a wasteful number, since it uses less digits than its factorization.

217428731326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18268.

The product of its digits is 677376, while the sum is 46.

The spelling of 217428731326 in words is "two hundred seventeen billion, four hundred twenty-eight million, seven hundred thirty-one thousand, three hundred twenty-six".