211021013381 has 2 divisors, whose sum is σ = 211021013382. Its totient is φ = 211021013380.

The previous prime is 211021013377. The next prime is 211021013389. The reversal of 211021013381 is 183310120112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 181382292100 + 29638721281 = 425890^2 + 172159^2 .

It is a cyclic number.

It is not a de Polignac number, because 211021013381 - 2² = 211021013377 is a prime.

It is a super-2 number, since 2×211021013381² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211021013389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105510506690 + 105510506691.

It is an arithmetic number, because the mean of its divisors is an integer number (105510506691).

Almost surely, 2^211021013381 is an apocalyptic number.

It is an amenable number.

211021013381 is a deficient number, since it is larger than the sum of its proper divisors (1).

211021013381 is an equidigital number, since it uses as much as digits as its factorization.

211021013381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 23.

Adding to 211021013381 its reverse (183310120112), we get a palindrome (394331133493).

The spelling of 211021013381 in words is "two hundred eleven billion, twenty-one million, thirteen thousand, three hundred eighty-one".