2135503331221 has 8 divisors (see below), whose sum is σ = 2435053572504. Its totient is φ = 1855278912000.

The previous prime is 2135503331219. The next prime is 2135503331279. The reversal of 2135503331221 is 1221333055312.

It can be written as a sum of positive squares in 4 ways, for example, as 594464130225 + 1541039200996 = 771015^2 + 1241386^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 2135503331221 - 2¹ = 2135503331219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2135503331201) 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, 4831455280 + ... + 4831455721.

It is an arithmetic number, because the mean of its divisors is an integer number (304381696563).

Almost surely, 2^{2135503331221} is an apocalyptic number.

It is an amenable number.

2135503331221 is a deficient number, since it is larger than the sum of its proper divisors (299550241283).

2135503331221 is a wasteful number, since it uses less digits than its factorization.

2135503331221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9662911031.

The product of its (nonzero) digits is 16200, while the sum is 31.

Adding to 2135503331221 its reverse (1221333055312), we get a palindrome (3356836386533).

The spelling of 2135503331221 in words is "two trillion, one hundred thirty-five billion, five hundred three million, three hundred thirty-one thousand, two hundred twenty-one".