1221304063 has 16 divisors (see below), whose sum is σ = 1411571200. Its totient is φ = 1035019296.

The previous prime is 1221304037. The next prime is 1221304067. The reversal of 1221304063 is 3604031221.

It is a cyclic number.

It is not a de Polignac number, because 1221304063 - 2¹⁷ = 1221172991 is a prime.

It is a super-2 number, since 2×1221304063² = 2983167228600615938, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221304067) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 717988 + ... + 719686.

It is an arithmetic number, because the mean of its divisors is an integer number (88223200).

Almost surely, 2^1221304063 is an apocalyptic number.

1221304063 is a deficient number, since it is larger than the sum of its proper divisors (190267137).

1221304063 is a wasteful number, since it uses less digits than its factorization.

1221304063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2806.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 1221304063 is about 34947.1610148807. The cubic root of 1221304063 is about 1068.9103131814.

Adding to 1221304063 its reverse (3604031221), we get a palindrome (4825335284).

The spelling of 1221304063 in words is "one billion, two hundred twenty-one million, three hundred four thousand, sixty-three".