221440400009 has 2 divisors, whose sum is σ = 221440400010. Its totient is φ = 221440400008.

The previous prime is 221440399991. The next prime is 221440400029. The reversal of 221440400009 is 900004044122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 218345925625 + 3094474384 = 467275^2 + 55628^2 .

It is a cyclic number.

It is not a de Polignac number, because 221440400009 - 2²⁸ = 221171964553 is a prime.

It is a super-2 number, since 2×221440400009² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (221440400029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110720200004 + 110720200005.

It is an arithmetic number, because the mean of its divisors is an integer number (110720200005).

Almost surely, 2^221440400009 is an apocalyptic number.

It is an amenable number.

221440400009 is a deficient number, since it is larger than the sum of its proper divisors (1).

221440400009 is an equidigital number, since it uses as much as digits as its factorization.

221440400009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 26.

The spelling of 221440400009 in words is "two hundred twenty-one billion, four hundred forty million, four hundred thousand, nine".