211220234321 has 2 divisors, whose sum is σ = 211220234322. Its totient is φ = 211220234320.

The previous prime is 211220234299. The next prime is 211220234347. The reversal of 211220234321 is 123432022112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 192523500625 + 18696733696 = 438775^2 + 136736^2 .

It is a cyclic number.

It is not a de Polignac number, because 211220234321 - 2²² = 211216040017 is a prime.

It is a super-2 number, since 2×211220234321² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (211220234221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105610117160 + 105610117161.

It is an arithmetic number, because the mean of its divisors is an integer number (105610117161).

Almost surely, 2^211220234321 is an apocalyptic number.

It is an amenable number.

211220234321 is a deficient number, since it is larger than the sum of its proper divisors (1).

211220234321 is an equidigital number, since it uses as much as digits as its factorization.

211220234321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 211220234321 its reverse (123432022112), we get a palindrome (334652256433).

The spelling of 211220234321 in words is "two hundred eleven billion, two hundred twenty million, two hundred thirty-four thousand, three hundred twenty-one".