211212632221 has 2 divisors, whose sum is σ = 211212632222. Its totient is φ = 211212632220.

The previous prime is 211212632219. The next prime is 211212632231. The reversal of 211212632221 is 122236212112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 191615432121 + 19597200100 = 437739^2 + 139990^2 .

It is a cyclic number.

It is not a de Polignac number, because 211212632221 - 2¹ = 211212632219 is a prime.

It is a super-2 number, since 2×211212632221² (a number of 23 digits) contains 22 as substring.

Together with 211212632219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211212632231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105606316110 + 105606316111.

It is an arithmetic number, because the mean of its divisors is an integer number (105606316111).

Almost surely, 2^211212632221 is an apocalyptic number.

It is an amenable number.

211212632221 is a deficient number, since it is larger than the sum of its proper divisors (1).

211212632221 is an equidigital number, since it uses as much as digits as its factorization.

211212632221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 25.

Adding to 211212632221 its reverse (122236212112), we get a palindrome (333448844333).

The spelling of 211212632221 in words is "two hundred eleven billion, two hundred twelve million, six hundred thirty-two thousand, two hundred twenty-one".