211142341021 has 2 divisors, whose sum is σ = 211142341022. Its totient is φ = 211142341020.

The previous prime is 211142341013. The next prime is 211142341061. The reversal of 211142341021 is 120143241112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120089278521 + 91053062500 = 346539^2 + 301750^2 .

It is a cyclic number.

It is not a de Polignac number, because 211142341021 - 2³ = 211142341013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211142340983 and 211142341001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211142341061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105571170510 + 105571170511.

It is an arithmetic number, because the mean of its divisors is an integer number (105571170511).

Almost surely, 2^211142341021 is an apocalyptic number.

It is an amenable number.

211142341021 is a deficient number, since it is larger than the sum of its proper divisors (1).

211142341021 is an equidigital number, since it uses as much as digits as its factorization.

211142341021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 22.

Adding to 211142341021 its reverse (120143241112), we get a palindrome (331285582133).

Subtracting from 211142341021 its reverse (120143241112), we obtain a palindrome (90999099909).

The spelling of 211142341021 in words is "two hundred eleven billion, one hundred forty-two million, three hundred forty-one thousand, twenty-one".