2135421 has 18 divisors (see below), whose sum is σ = 3280602. Its totient is φ = 1338240.

The previous prime is 2135417. The next prime is 2135447. The reversal of 2135421 is 1245312.

2135421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 622521 + 1512900 = 789^2 + 1230^2 .

It is not a de Polignac number, because 2135421 - 2² = 2135417 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2135394 and 2135403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2135401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2191 + ... + 3011.

2^2135421 is an apocalyptic number.

It is an amenable number.

2135421 is a deficient number, since it is larger than the sum of its proper divisors (1145181).

2135421 is a wasteful number, since it uses less digits than its factorization.

2135421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 861 (or 841 counting only the distinct ones).

The product of its digits is 240, while the sum is 18.

The square root of 2135421 is about 1461.3079757532. The cubic root of 2135421 is about 128.7738963406.

It can be divided in two parts, 2135 and 421, that added together give a triangular number (2556 = T₇₁).

The spelling of 2135421 in words is "two million, one hundred thirty-five thousand, four hundred twenty-one".