211220121022081 has 2 divisors, whose sum is σ = 211220121022082. Its totient is φ = 211220121022080.

The previous prime is 211220121022069. The next prime is 211220121022139. The reversal of 211220121022081 is 180220121022112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 209824379619856 + 1395741402225 = 14485316^2 + 1181415^2 .

It is a cyclic number.

It is not a de Polignac number, because 211220121022081 - 2¹⁷ = 211220120891009 is a prime.

It is a super-2 number, since 2×211220121022081² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (211220121026081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105610060511040 + 105610060511041.

It is an arithmetic number, because the mean of its divisors is an integer number (105610060511041).

Almost surely, 2^{211220121022081} is an apocalyptic number.

It is an amenable number.

211220121022081 is a deficient number, since it is larger than the sum of its proper divisors (1).

211220121022081 is an equidigital number, since it uses as much as digits as its factorization.

211220121022081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 512, while the sum is 25.

Adding to 211220121022081 its reverse (180220121022112), we get a palindrome (391440242044193).

The spelling of 211220121022081 in words is "two hundred eleven trillion, two hundred twenty billion, one hundred twenty-one million, twenty-two thousand, eighty-one".