1213100444 has 24 divisors (see below), whose sum is σ = 2165495808. Its totient is φ = 594503280.

The previous prime is 1213100419. The next prime is 1213100453. The reversal of 1213100444 is 4440013121.

It is a super-2 number, since 2×1213100444² = 2943225374465994272, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27779 + ... + 56549.

It is an arithmetic number, because the mean of its divisors is an integer number (90228992).

Almost surely, 2^1213100444 is an apocalyptic number.

It is an amenable number.

1213100444 is a deficient number, since it is larger than the sum of its proper divisors (952395364).

1213100444 is a wasteful number, since it uses less digits than its factorization.

1213100444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28985 (or 28983 counting only the distinct ones).

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

The square root of 1213100444 is about 34829.5914991836. The cubic root of 1213100444 is about 1066.5116092752.

Adding to 1213100444 its reverse (4440013121), we get a palindrome (5653113565).

The spelling of 1213100444 in words is "one billion, two hundred thirteen million, one hundred thousand, four hundred forty-four".