1335721121 has 8 divisors (see below), whose sum is σ = 1579177920. Its totient is φ = 1105424208.

The previous prime is 1335721117. The next prime is 1335721129. The reversal of 1335721121 is 1211275331.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1335721121 - 2² = 1335721117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1335721129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3289751 + ... + 3290156.

It is an arithmetic number, because the mean of its divisors is an integer number (197397240).

Almost surely, 2^1335721121 is an apocalyptic number.

It is an amenable number.

1335721121 is a deficient number, since it is larger than the sum of its proper divisors (243456799).

1335721121 is an equidigital number, since it uses as much as digits as its factorization.

1335721121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6579943.

The product of its digits is 1260, while the sum is 26.

The square root of 1335721121 is about 36547.5186709030. The cubic root of 1335721121 is about 1101.2990495756.

Adding to 1335721121 its reverse (1211275331), we get a palindrome (2546996452).

The spelling of 1335721121 in words is "one billion, three hundred thirty-five million, seven hundred twenty-one thousand, one hundred twenty-one".