2150021 has 4 divisors (see below), whose sum is σ = 2263200. Its totient is φ = 2036844.

The previous prime is 2150011. The next prime is 2150023. The reversal of 2150021 is 1200512.

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 a cyclic number.

It is not a de Polignac number, because 2150021 - 2¹⁸ = 1887877 is a prime.

It is a super-3 number, since 3×2150021³ = 29815998661033377783, which contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2149984 and 2150011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2150023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56561 + ... + 56598.

It is an arithmetic number, because the mean of its divisors is an integer number (565800).

2^2150021 is an apocalyptic number.

It is an amenable number.

2150021 is a deficient number, since it is larger than the sum of its proper divisors (113179).

2150021 is a wasteful number, since it uses less digits than its factorization.

2150021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113178.

The product of its (nonzero) digits is 20, while the sum is 11.

The square root of 2150021 is about 1466.2949907846. The cubic root of 2150021 is about 129.0667082819.

Adding to 2150021 its reverse (1200512), we get a palindrome (3350533).

The spelling of 2150021 in words is "two million, one hundred fifty thousand, twenty-one".