1213321734 has 16 divisors (see below), whose sum is σ = 2696270640. Its totient is φ = 404440560.

The previous prime is 1213321729. The next prime is 1213321777. The reversal of 1213321734 is 4371233121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 1213321698 and 1213321707.

It is a congruent number.

It is an unprimeable number.

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, 11234407 + ... + 11234514.

It is an arithmetic number, because the mean of its divisors is an integer number (168516915).

Almost surely, 2^1213321734 is an apocalyptic number.

1213321734 is an abundant number, since it is smaller than the sum of its proper divisors (1482948906).

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

1213321734 is a wasteful number, since it uses less digits than its factorization.

1213321734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22468932 (or 22468926 counting only the distinct ones).

The product of its digits is 3024, while the sum is 27.

The square root of 1213321734 is about 34832.7681070569. The cubic root of 1213321734 is about 1066.5764552397.

Adding to 1213321734 its reverse (4371233121), we get a palindrome (5584554855).

The spelling of 1213321734 in words is "one billion, two hundred thirteen million, three hundred twenty-one thousand, seven hundred thirty-four".