211220212220077 has 2 divisors, whose sum is σ = 211220212220078. Its totient is φ = 211220212220076.

The previous prime is 211220212220047. The next prime is 211220212220119. The reversal of 211220212220077 is 770022212022112.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 192471061079236 + 18749151140841 = 13873394^2 + 4330029^2 .

It is a cyclic number.

It is not a de Polignac number, because 211220212220077 - 2⁷ = 211220212219949 is a prime.

It is a super-3 number, since 3×211220212220077³ (a number of 44 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211220212220047) 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, 105610106110038 + 105610106110039.

It is an arithmetic number, because the mean of its divisors is an integer number (105610106110039).

Almost surely, 2^{211220212220077} is an apocalyptic number.

It is an amenable number.

211220212220077 is a deficient number, since it is larger than the sum of its proper divisors (1).

211220212220077 is an equidigital number, since it uses as much as digits as its factorization.

211220212220077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6272, while the sum is 31.

Adding to 211220212220077 its reverse (770022212022112), we get a palindrome (981242424242189).

The spelling of 211220212220077 in words is "two hundred eleven trillion, two hundred twenty billion, two hundred twelve million, two hundred twenty thousand, seventy-seven".