1213204421 has 8 divisors (see below), whose sum is σ = 1425303264. Its totient is φ = 1018073520.

The previous prime is 1213204379. The next prime is 1213204423. The reversal of 1213204421 is 1244023121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1213204421 - 2³⁰ = 139462597 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1213204393 and 1213204402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213204423) 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 7 ways as a sum of consecutive naturals, for example, 4241831 + ... + 4242116.

It is an arithmetic number, because the mean of its divisors is an integer number (178162908).

Almost surely, 2^1213204421 is an apocalyptic number.

1213204421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1213204421 is a deficient number, since it is larger than the sum of its proper divisors (212098843).

1213204421 is a wasteful number, since it uses less digits than its factorization.

1213204421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8483971.

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

The square root of 1213204421 is about 34831.0841203658. The cubic root of 1213204421 is about 1066.5420792746.

Adding to 1213204421 its reverse (1244023121), we get a palindrome (2457227542).

The spelling of 1213204421 in words is "one billion, two hundred thirteen million, two hundred four thousand, four hundred twenty-one".