210440140422221 has 4 divisors (see below), whose sum is σ = 210448169756700. Its totient is φ = 210432111087744.

The previous prime is 210440140422167. The next prime is 210440140422269. The reversal of 210440140422221 is 122224041044012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 113486302470025 + 96953837952196 = 10652995^2 + 9846514^2 .

It is a cyclic number.

It is not a de Polignac number, because 210440140422221 - 2²² = 210440136227917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210440140422121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4014627926 + ... + 4014680343.

It is an arithmetic number, because the mean of its divisors is an integer number (52612042439175).

Almost surely, 2^{210440140422221} is an apocalyptic number.

It is an amenable number.

210440140422221 is a deficient number, since it is larger than the sum of its proper divisors (8029334479).

210440140422221 is an equidigital number, since it uses as much as digits as its factorization.

210440140422221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8029334478.

The product of its (nonzero) digits is 8192, while the sum is 29.

Adding to 210440140422221 its reverse (122224041044012), we get a palindrome (332664181466233).

The spelling of 210440140422221 in words is "two hundred ten trillion, four hundred forty billion, one hundred forty million, four hundred twenty-two thousand, two hundred twenty-one".