2136021 has 4 divisors (see below), whose sum is σ = 2848032. Its totient is φ = 1424012.

The previous prime is 2136019. The next prime is 2136023. The reversal of 2136021 is 1206312.

2136021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (2136019) and next prime (2136023).

It is a cyclic number.

It is not a de Polignac number, because 2136021 - 2¹ = 2136019 is a prime.

It is a D-number.

2136021 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2136023) 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 3 ways as a sum of consecutive naturals, for example, 356001 + ... + 356006.

It is an arithmetic number, because the mean of its divisors is an integer number (712008).

2^2136021 is an apocalyptic number.

It is an amenable number.

2136021 is a deficient number, since it is larger than the sum of its proper divisors (712011).

2136021 is an equidigital number, since it uses as much as digits as its factorization.

2136021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 712010.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 2136021 is about 1461.5132568677. The cubic root of 2136021 is about 128.7859559614.

The spelling of 2136021 in words is "two million, one hundred thirty-six thousand, twenty-one".