1210220121989 has 2 divisors, whose sum is σ = 1210220121990. Its totient is φ = 1210220121988.

The previous prime is 1210220121953. The next prime is 1210220122061. The reversal of 1210220121989 is 9891210220121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1188028061089 + 22192060900 = 1089967^2 + 148970^2 .

It is a cyclic number.

It is not a de Polignac number, because 1210220121989 - 2¹⁶ = 1210220056453 is a prime.

It is a super-2 number, since 2×1210220121989² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1210220121949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605110060994 + 605110060995.

It is an arithmetic number, because the mean of its divisors is an integer number (605110060995).

Almost surely, 2^{1210220121989} is an apocalyptic number.

It is an amenable number.

1210220121989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1210220121989 is an equidigital number, since it uses as much as digits as its factorization.

1210220121989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 38.

The spelling of 1210220121989 in words is "one trillion, two hundred ten billion, two hundred twenty million, one hundred twenty-one thousand, nine hundred eighty-nine".