1321212424 has 32 divisors (see below), whose sum is σ = 2980180800. Its totient is φ = 536431680.

The previous prime is 1321212419. The next prime is 1321212457. The reversal of 1321212424 is 4242121231.

It is a junction number, because it is equal to n+sod(n) for n = 1321212395 and 1321212404.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 619807 + ... + 621934.

It is an arithmetic number, because the mean of its divisors is an integer number (93130650).

Almost surely, 2^1321212424 is an apocalyptic number.

1321212424 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1321212424 is an abundant number, since it is smaller than the sum of its proper divisors (1658968376).

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

1321212424 is a wasteful number, since it uses less digits than its factorization.

1321212424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1241773 (or 1241769 counting only the distinct ones).

The product of its digits is 768, while the sum is 22.

The square root of 1321212424 is about 36348.4858556722. The cubic root of 1321212424 is about 1097.2970618072.

Adding to 1321212424 its reverse (4242121231), we get a palindrome (5563333655).

The spelling of 1321212424 in words is "one billion, three hundred twenty-one million, two hundred twelve thousand, four hundred twenty-four".