1220121220189 has 2 divisors, whose sum is σ = 1220121220190. Its totient is φ = 1220121220188.

The previous prime is 1220121220163. The next prime is 1220121220229. The reversal of 1220121220189 is 9810221210221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1220119068100 + 2152089 = 1104590^2 + 1467^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220121220189 - 2¹³ = 1220121211997 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1220121220189.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220121220159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610060610094 + 610060610095.

It is an arithmetic number, because the mean of its divisors is an integer number (610060610095).

Almost surely, 2^{1220121220189} is an apocalyptic number.

It is an amenable number.

1220121220189 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220121220189 is an equidigital number, since it uses as much as digits as its factorization.

1220121220189 is an evil number, because the sum of its binary digits is even.

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

The spelling of 1220121220189 in words is "one trillion, two hundred twenty billion, one hundred twenty-one million, two hundred twenty thousand, one hundred eighty-nine".