1212321404 has 36 divisors (see below), whose sum is σ = 2450057904. Its totient is φ = 514136448.

The previous prime is 1212321401. The next prime is 1212321419. The reversal of 1212321404 is 4041232121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212321401) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 1958207 + ... + 1958825.

It is an arithmetic number, because the mean of its divisors is an integer number (68057164).

Almost surely, 2^1212321404 is an apocalyptic number.

1212321404 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1212321404 is an abundant number, since it is smaller than the sum of its proper divisors (1237736500).

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

1212321404 is an equidigital number, since it uses as much as digits as its factorization.

1212321404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1362 (or 741 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 1212321404 is about 34818.4061094129. The cubic root of 1212321404 is about 1066.2832596424.

Adding to 1212321404 its reverse (4041232121), we get a palindrome (5253553525).

The spelling of 1212321404 in words is "one billion, two hundred twelve million, three hundred twenty-one thousand, four hundred four".