1221103061 has 2 divisors, whose sum is σ = 1221103062. Its totient is φ = 1221103060.

The previous prime is 1221103043. The next prime is 1221103067. The reversal of 1221103061 is 1603011221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 800607025 + 420496036 = 28295^2 + 20506^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221103061 - 2¹⁴ = 1221086677 is a prime.

It is a super-3 number, since 3×1221103061³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221103067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610551530 + 610551531.

It is an arithmetic number, because the mean of its divisors is an integer number (610551531).

Almost surely, 2^1221103061 is an apocalyptic number.

It is an amenable number.

1221103061 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221103061 is an equidigital number, since it uses as much as digits as its factorization.

1221103061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 1221103061 is about 34944.2850978526. The cubic root of 1221103061 is about 1068.8516696093.

Adding to 1221103061 its reverse (1603011221), we get a palindrome (2824114282).

The spelling of 1221103061 in words is "one billion, two hundred twenty-one million, one hundred three thousand, sixty-one".