2124021 has 4 divisors (see below), whose sum is σ = 2832032. Its totient is φ = 1416012.

The previous prime is 2124019. The next prime is 2124037. The reversal of 2124021 is 1204212.

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 not a de Polignac number, because 2124021 - 2¹ = 2124019 is a prime.

It is a super-2 number, since 2×2124021² = 9022930416882, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2123988 and 2124006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2124011) 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, 354001 + ... + 354006.

It is an arithmetic number, because the mean of its divisors is an integer number (708008).

2^2124021 is an apocalyptic number.

It is an amenable number.

2124021 is a deficient number, since it is larger than the sum of its proper divisors (708011).

2124021 is an equidigital number, since it uses as much as digits as its factorization.

2124021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 708010.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 2124021 is about 1457.4021407971. The cubic root of 2124021 is about 128.5443330909.

Adding to 2124021 its reverse (1204212), we get a palindrome (3328233).

It can be divided in two parts, 21240 and 21, that multiplied together give a triangular number (446040 = T₉₄₄).

The spelling of 2124021 in words is "two million, one hundred twenty-four thousand, twenty-one".