1321100412 has 24 divisors (see below), whose sum is σ = 3091410000. Its totient is φ = 439103616.

The previous prime is 1321100399. The next prime is 1321100441. The reversal of 1321100412 is 2140011231.

It is a junction number, because it is equal to n+sod(n) for n = 1321100391 and 1321100400.

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, 153537 + ... + 161912.

It is an arithmetic number, because the mean of its divisors is an integer number (128808750).

Almost surely, 2^1321100412 is an apocalyptic number.

1321100412 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1321100412 is an abundant number, since it is smaller than the sum of its proper divisors (1770309588).

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

1321100412 is a wasteful number, since it uses less digits than its factorization.

1321100412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315805 (or 315803 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 1321100412 is about 36346.9450160533. The cubic root of 1321100412 is about 1097.2660514237.

Adding to 1321100412 its reverse (2140011231), we get a palindrome (3461111643).

The spelling of 1321100412 in words is "one billion, three hundred twenty-one million, one hundred thousand, four hundred twelve".