211440334031621 has 2 divisors, whose sum is σ = 211440334031622. Its totient is φ = 211440334031620.

The previous prime is 211440334031603. The next prime is 211440334031653. The reversal of 211440334031621 is 126130433044112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 132670981487521 + 78769352544100 = 11518289^2 + 8875210^2 .

It is a cyclic number.

It is not a de Polignac number, because 211440334031621 - 2³⁰ = 211439260289797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211440334036621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105720167015810 + 105720167015811.

It is an arithmetic number, because the mean of its divisors is an integer number (105720167015811).

Almost surely, 2^{211440334031621} is an apocalyptic number.

It is an amenable number.

211440334031621 is a deficient number, since it is larger than the sum of its proper divisors (1).

211440334031621 is an equidigital number, since it uses as much as digits as its factorization.

211440334031621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 35.

Adding to 211440334031621 its reverse (126130433044112), we get a palindrome (337570767075733).

The spelling of 211440334031621 in words is "two hundred eleven trillion, four hundred forty billion, three hundred thirty-four million, thirty-one thousand, six hundred twenty-one".