1221303463 has 4 divisors (see below), whose sum is σ = 1221597160. Its totient is φ = 1221009768.

The previous prime is 1221303439. The next prime is 1221303491. The reversal of 1221303463 is 3643031221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3643031221 = 6781 ⋅537241.

It is a cyclic number.

It is not a de Polignac number, because 1221303463 - 2¹⁷ = 1221172391 is a prime.

It is a super-3 number, since 3×1221303463³ (a number of 28 digits) contains 333 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 (1221303263) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140520 + ... + 148957.

It is an arithmetic number, because the mean of its divisors is an integer number (305399290).

Almost surely, 2^1221303463 is an apocalyptic number.

1221303463 is a deficient number, since it is larger than the sum of its proper divisors (293697).

1221303463 is an equidigital number, since it uses as much as digits as its factorization.

1221303463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293696.

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 1221303463 is about 34947.1524304914. The cubic root of 1221303463 is about 1068.9101381373.

Adding to 1221303463 its reverse (3643031221), we get a palindrome (4864334684).

The spelling of 1221303463 in words is "one billion, two hundred twenty-one million, three hundred three thousand, four hundred sixty-three".