1213604421 has 4 divisors (see below), whose sum is σ = 1618139232. Its totient is φ = 809069612.

The previous prime is 1213604389. The next prime is 1213604443. The reversal of 1213604421 is 1244063121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1213604421 - 2⁵ = 1213604389 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1213604391 and 1213604400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213604471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 202267401 + ... + 202267406.

It is an arithmetic number, because the mean of its divisors is an integer number (404534808).

Almost surely, 2^1213604421 is an apocalyptic number.

It is an amenable number.

1213604421 is a deficient number, since it is larger than the sum of its proper divisors (404534811).

1213604421 is an equidigital number, since it uses as much as digits as its factorization.

1213604421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404534810.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 1213604421 is about 34836.8256447111. The cubic root of 1213604421 is about 1066.6592812748.

Adding to 1213604421 its reverse (1244063121), we get a palindrome (2457667542).

The spelling of 1213604421 in words is "one billion, two hundred thirteen million, six hundred four thousand, four hundred twenty-one".