221432747403409 has 2 divisors, whose sum is σ = 221432747403410. Its totient is φ = 221432747403408.

The previous prime is 221432747403347. The next prime is 221432747403509. The reversal of 221432747403409 is 904304747234122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 221130580611600 + 302166791809 = 14870460^2 + 549697^2 .

It is a cyclic number.

It is not a de Polignac number, because 221432747403409 - 2⁴³ = 212636654381201 is a prime.

It is not a weakly prime, because it can be changed into another prime (221432747403509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110716373701704 + 110716373701705.

It is an arithmetic number, because the mean of its divisors is an integer number (110716373701705).

Almost surely, 2^{221432747403409} is an apocalyptic number.

It is an amenable number.

221432747403409 is a deficient number, since it is larger than the sum of its proper divisors (1).

221432747403409 is an equidigital number, since it uses as much as digits as its factorization.

221432747403409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8128512, while the sum is 52.

The spelling of 221432747403409 in words is "two hundred twenty-one trillion, four hundred thirty-two billion, seven hundred forty-seven million, four hundred three thousand, four hundred nine".