212021055511 has 2 divisors, whose sum is σ = 212021055512. Its totient is φ = 212021055510.

The previous prime is 212021055487. The next prime is 212021055517. The reversal of 212021055511 is 115550120212.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 212021055511 - 2¹¹ = 212021053463 is a prime.

It is a super-2 number, since 2×212021055511² (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 (212021055517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106010527755 + 106010527756.

It is an arithmetic number, because the mean of its divisors is an integer number (106010527756).

Almost surely, 2^212021055511 is an apocalyptic number.

212021055511 is a deficient number, since it is larger than the sum of its proper divisors (1).

212021055511 is an equidigital number, since it uses as much as digits as its factorization.

212021055511 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1000, while the sum is 25.

Adding to 212021055511 its reverse (115550120212), we get a palindrome (327571175723).

The spelling of 212021055511 in words is "two hundred twelve billion, twenty-one million, fifty-five thousand, five hundred eleven".