1221343600 has 30 divisors (see below), whose sum is σ = 2934278960. Its totient is φ = 488537280.

The previous prime is 1221343573. The next prime is 1221343621. The reversal of 1221343600 is 63431221.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1526280 + ... + 1527079.

Almost surely, 2^1221343600 is an apocalyptic number.

1221343600 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221343600 is an abundant number, since it is smaller than the sum of its proper divisors (1712935360).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221343600 is a wasteful number, since it uses less digits than its factorization.

1221343600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3053377 (or 3053366 counting only the distinct ones).

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

The square root of 1221343600 is about 34947.7266785695. The cubic root of 1221343600 is about 1068.9218475875.

Adding to 1221343600 its reverse (63431221), we get a palindrome (1284774821).

The spelling of 1221343600 in words is "one billion, two hundred twenty-one million, three hundred forty-three thousand, six hundred".