1221011053 has 2 divisors, whose sum is σ = 1221011054. Its totient is φ = 1221011052.

The previous prime is 1221011047. The next prime is 1221011081. The reversal of 1221011053 is 3501101221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 902281444 + 318729609 = 30038^2 + 17853^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221011053 - 2⁵ = 1221011021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221011023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610505526 + 610505527.

It is an arithmetic number, because the mean of its divisors is an integer number (610505527).

Almost surely, 2^1221011053 is an apocalyptic number.

It is an amenable number.

1221011053 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221011053 is an equidigital number, since it uses as much as digits as its factorization.

1221011053 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60, while the sum is 16.

The square root of 1221011053 is about 34942.9685773833. The cubic root of 1221011053 is about 1068.8248235612.

Adding to 1221011053 its reverse (3501101221), we get a palindrome (4722112274).

The spelling of 1221011053 in words is "one billion, two hundred twenty-one million, eleven thousand, fifty-three".