221440061 has 2 divisors, whose sum is σ = 221440062. Its totient is φ = 221440060.

The previous prime is 221440019. The next prime is 221440073. The reversal of 221440061 is 160044122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 182925625 + 38514436 = 13525^2 + 6206^2 .

It is a cyclic number.

It is not a de Polignac number, because 221440061 - 2⁶ = 221439997 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221442061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110720030 + 110720031.

It is an arithmetic number, because the mean of its divisors is an integer number (110720031).

Almost surely, 2^221440061 is an apocalyptic number.

It is an amenable number.

221440061 is a deficient number, since it is larger than the sum of its proper divisors (1).

221440061 is an equidigital number, since it uses as much as digits as its factorization.

221440061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 221440061 is about 14880.8622398032. The cubic root of 221440061 is about 604.9953882580.

Adding to 221440061 its reverse (160044122), we get a palindrome (381484183).

The spelling of 221440061 in words is "two hundred twenty-one million, four hundred forty thousand, sixty-one".