1221342424 has 32 divisors (see below), whose sum is σ = 2508343200. Its totient is φ = 554928640.

The previous prime is 1221342413. The next prime is 1221342457. The reversal of 1221342424 is 4242431221.

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 7 ways as a sum of consecutive naturals, for example, 150892 + ... + 158779.

It is an arithmetic number, because the mean of its divisors is an integer number (78385725).

Almost surely, 2^1221342424 is an apocalyptic number.

It is an amenable number.

1221342424 is an abundant number, since it is smaller than the sum of its proper divisors (1287000776).

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

1221342424 is a wasteful number, since it uses less digits than its factorization.

1221342424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309723 (or 309719 counting only the distinct ones).

The product of its digits is 3072, while the sum is 25.

The square root of 1221342424 is about 34947.7098534367. The cubic root of 1221342424 is about 1068.9215045084.

Adding to 1221342424 its reverse (4242431221), we get a palindrome (5463773645).

The spelling of 1221342424 in words is "one billion, two hundred twenty-one million, three hundred forty-two thousand, four hundred twenty-four".