221020212012109 has 2 divisors, whose sum is σ = 221020212012110. Its totient is φ = 221020212012108.

The previous prime is 221020212012091. The next prime is 221020212012137. The reversal of 221020212012109 is 901210212020122.

It is a happy number.

Together with previous prime (221020212012091) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 214909442844100 + 6110769168009 = 14659790^2 + 2471997^2 .

It is a cyclic number.

It is not a de Polignac number, because 221020212012109 - 2¹⁹ = 221020211487821 is a prime.

It is a super-2 number, since 2×221020212012109² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221020212012209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110510106006054 + 110510106006055.

It is an arithmetic number, because the mean of its divisors is an integer number (110510106006055).

Almost surely, 2^{221020212012109} is an apocalyptic number.

It is an amenable number.

221020212012109 is a deficient number, since it is larger than the sum of its proper divisors (1).

221020212012109 is an equidigital number, since it uses as much as digits as its factorization.

221020212012109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 25.

The spelling of 221020212012109 in words is "two hundred twenty-one trillion, twenty billion, two hundred twelve million, twelve thousand, one hundred nine".