1220221201993 has 2 divisors, whose sum is σ = 1220221201994. Its totient is φ = 1220221201992.

The previous prime is 1220221201973. The next prime is 1220221202027. The reversal of 1220221201993 is 3991021220221.

It is an a-pointer prime, because the next prime (1220221202027) can be obtained adding 1220221201993 to its sum of digits (34).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1021690359369 + 198530842624 = 1010787^2 + 445568^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220221201993 - 2¹⁷ = 1220221070921 is a prime.

It is not a weakly prime, because it can be changed into another prime (1220221201973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610110600996 + 610110600997.

It is an arithmetic number, because the mean of its divisors is an integer number (610110600997).

Almost surely, 2^{1220221201993} is an apocalyptic number.

It is an amenable number.

1220221201993 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220221201993 is an equidigital number, since it uses as much as digits as its factorization.

1220221201993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 34.

The spelling of 1220221201993 in words is "one trillion, two hundred twenty billion, two hundred twenty-one million, two hundred one thousand, nine hundred ninety-three".