1331344421 has 16 divisors (see below), whose sum is σ = 1542868800. Its totient is φ = 1136073600.

The previous prime is 1331344373. The next prime is 1331344423. The reversal of 1331344421 is 1244431331.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1331344421 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331344423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6440 + ... + 52001.

It is an arithmetic number, because the mean of its divisors is an integer number (96429300).

Almost surely, 2^1331344421 is an apocalyptic number.

1331344421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1331344421 is a deficient number, since it is larger than the sum of its proper divisors (211524379).

1331344421 is a wasteful number, since it uses less digits than its factorization.

1331344421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58580.

The product of its digits is 3456, while the sum is 26.

The square root of 1331344421 is about 36487.5926994369. The cubic root of 1331344421 is about 1100.0948736352.

Adding to 1331344421 its reverse (1244431331), we get a palindrome (2575775752).

The spelling of 1331344421 in words is "one billion, three hundred thirty-one million, three hundred forty-four thousand, four hundred twenty-one".