1221223287 has 4 divisors (see below), whose sum is σ = 1628297720. Its totient is φ = 814148856.

The previous prime is 1221223229. The next prime is 1221223301. The reversal of 1221223287 is 7823221221.

1221223287 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1221223287 - 2¹⁸ = 1220961143 is a prime.

It is a super-3 number, since 3×1221223287³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221223187) 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, 203537212 + ... + 203537217.

It is an arithmetic number, because the mean of its divisors is an integer number (407074430).

Almost surely, 2^1221223287 is an apocalyptic number.

1221223287 is a deficient number, since it is larger than the sum of its proper divisors (407074433).

1221223287 is an equidigital number, since it uses as much as digits as its factorization.

1221223287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407074432.

The product of its digits is 5376, while the sum is 30.

The square root of 1221223287 is about 34946.0053081894. The cubic root of 1221223287 is about 1068.8867470590.

The spelling of 1221223287 in words is "one billion, two hundred twenty-one million, two hundred twenty-three thousand, two hundred eighty-seven".