2135221121 has 16 divisors (see below), whose sum is σ = 2454494400. Its totient is φ = 1837022400.

The previous prime is 2135221093. The next prime is 2135221147. The reversal of 2135221121 is 1211225312.

It is a cyclic number.

It is not a de Polignac number, because 2135221121 - 2¹⁰ = 2135220097 is a prime.

It is a super-3 number, since 3×2135221121³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2135221093 and 2135221102.

It is not an unprimeable number, because it can be changed into a prime (2135221171) 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, 216935 + ... + 226563.

It is an arithmetic number, because the mean of its divisors is an integer number (153405900).

Almost surely, 2^2135221121 is an apocalyptic number.

It is an amenable number.

2135221121 is a deficient number, since it is larger than the sum of its proper divisors (319273279).

2135221121 is a wasteful number, since it uses less digits than its factorization.

2135221121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10720.

The product of its digits is 240, while the sum is 20.

The square root of 2135221121 is about 46208.4529171882. The cubic root of 2135221121 is about 1287.6987839739.

Adding to 2135221121 its reverse (1211225312), we get a palindrome (3346446433).

It can be divided in two parts, 21352211 and 21, that multiplied together give a triangular number (448396431 = T₂₉₉₄₆).

The spelling of 2135221121 in words is "two billion, one hundred thirty-five million, two hundred twenty-one thousand, one hundred twenty-one".