2135521 has 2 divisors, whose sum is σ = 2135522. Its totient is φ = 2135520.

The previous prime is 2135519. The next prime is 2135533. The reversal of 2135521 is 1255312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2117025 + 18496 = 1455^2 + 136^2 .

It is a cyclic number.

It is not a de Polignac number, because 2135521 - 2¹ = 2135519 is a prime.

Together with 2135519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2135921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1067760 + 1067761.

It is an arithmetic number, because the mean of its divisors is an integer number (1067761).

2^2135521 is an apocalyptic number.

It is an amenable number.

2135521 is a deficient number, since it is larger than the sum of its proper divisors (1).

2135521 is an equidigital number, since it uses as much as digits as its factorization.

2135521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 300, while the sum is 19.

The square root of 2135521 is about 1461.3421912749. The cubic root of 2135521 is about 128.7759064342.

The spelling of 2135521 in words is "two million, one hundred thirty-five thousand, five hundred twenty-one".