212011021101221 has 2 divisors, whose sum is σ = 212011021101222. Its totient is φ = 212011021101220.

The previous prime is 212011021101107. The next prime is 212011021101233. The reversal of 212011021101221 is 122101120110212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 154859084289121 + 57151936812100 = 12444239^2 + 7559890^2 .

It is a cyclic number.

It is not a de Polignac number, because 212011021101221 - 2⁴⁶ = 141642276923557 is a prime.

It is a super-2 number, since 2×212011021101221² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 212011021101221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212011021106221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106005510550610 + 106005510550611.

It is an arithmetic number, because the mean of its divisors is an integer number (106005510550611).

Almost surely, 2^{212011021101221} is an apocalyptic number.

It is an amenable number.

212011021101221 is a deficient number, since it is larger than the sum of its proper divisors (1).

212011021101221 is an equidigital number, since it uses as much as digits as its factorization.

212011021101221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 212011021101221 its reverse (122101120110212), we get a palindrome (334112141211433).

The spelling of 212011021101221 in words is "two hundred twelve trillion, eleven billion, twenty-one million, one hundred one thousand, two hundred twenty-one".