1021220212189 has 2 divisors, whose sum is σ = 1021220212190. Its totient is φ = 1021220212188.

The previous prime is 1021220212183. The next prime is 1021220212219. The reversal of 1021220212189 is 9812120221201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1015795889689 + 5424322500 = 1007867^2 + 73650^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021220212189 - 2¹¹ = 1021220210141 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1021220212189.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1021220212183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510610106094 + 510610106095.

It is an arithmetic number, because the mean of its divisors is an integer number (510610106095).

Almost surely, 2^{1021220212189} is an apocalyptic number.

It is an amenable number.

1021220212189 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021220212189 is an equidigital number, since it uses as much as digits as its factorization.

1021220212189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 31.

The spelling of 1021220212189 in words is "one trillion, twenty-one billion, two hundred twenty million, two hundred twelve thousand, one hundred eighty-nine".