1213444133421 has 16 divisors (see below), whose sum is σ = 1771913209920. Its totient is φ = 734078327040.

The previous prime is 1213444133413. The next prime is 1213444133431. The reversal of 1213444133421 is 1243314443121.

It is a happy number.

It is not a de Polignac number, because 1213444133421 - 2³ = 1213444133413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213444133431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 263675260 + ... + 263679861.

It is an arithmetic number, because the mean of its divisors is an integer number (110744575620).

Almost surely, 2^{1213444133421} is an apocalyptic number.

It is an amenable number.

1213444133421 is a deficient number, since it is larger than the sum of its proper divisors (558469076499).

1213444133421 is a wasteful number, since it uses less digits than its factorization.

1213444133421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 527355196.

The product of its digits is 27648, while the sum is 33.

Adding to 1213444133421 its reverse (1243314443121), we get a palindrome (2456758576542).

The spelling of 1213444133421 in words is "one trillion, two hundred thirteen billion, four hundred forty-four million, one hundred thirty-three thousand, four hundred twenty-one".