1221346053 has 8 divisors (see below), whose sum is σ = 1809401600. Its totient is φ = 814230684.

The previous prime is 1221346051. The next prime is 1221346067. The reversal of 1221346053 is 3506431221.

1221346053 is a `hidden beast` number, since 1 + 2 + 21 + 34 + 605 + 3 = 666.

It is not a de Polignac number, because 1221346053 - 2¹ = 1221346051 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 45235039 = 1221346053 / (1 + 2 + 2 + 1 + 3 + 4 + 6 + 0 + 5 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221346051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22617493 + ... + 22617546.

It is an arithmetic number, because the mean of its divisors is an integer number (226175200).

Almost surely, 2^1221346053 is an apocalyptic number.

It is an amenable number.

1221346053 is a deficient number, since it is larger than the sum of its proper divisors (588055547).

1221346053 is an equidigital number, since it uses as much as digits as its factorization.

1221346053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45235048 (or 45235042 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 1221346053 is about 34947.7617738247. The cubic root of 1221346053 is about 1068.9225632102.

Adding to 1221346053 its reverse (3506431221), we get a palindrome (4727777274).

The spelling of 1221346053 in words is "one billion, two hundred twenty-one million, three hundred forty-six thousand, fifty-three".