1213103444 has 96 divisors (see below), whose sum is σ = 2631315456. Its totient is φ = 478114560.

The previous prime is 1213103429. The next prime is 1213103447. The reversal of 1213103444 is 4443013121.

It is a super-2 number, since 2×1213103444² = 2943239931689322272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213103447) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1965824 + ... + 1966440.

It is an arithmetic number, because the mean of its divisors is an integer number (27409536).

Almost surely, 2^1213103444 is an apocalyptic number.

1213103444 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1213103444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1315657728).

1213103444 is an abundant number, since it is smaller than the sum of its proper divisors (1418212012).

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

1213103444 is a wasteful number, since it uses less digits than its factorization.

1213103444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 765 (or 763 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 1213103444 is about 34829.6345659842. The cubic root of 1213103444 is about 1066.5124884363.

Adding to 1213103444 its reverse (4443013121), we get a palindrome (5656116565).

The spelling of 1213103444 in words is "one billion, two hundred thirteen million, one hundred three thousand, four hundred forty-four".