2124521021 has 8 divisors (see below), whose sum is σ = 2428379520. Its totient is φ = 1820751408.

The previous prime is 2124520999. The next prime is 2124521041. The reversal of 2124521021 is 1201254212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-2124521021 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2124520984 and 2124521002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2124521041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41000 + ... + 77006.

It is an arithmetic number, because the mean of its divisors is an integer number (303547440).

Almost surely, 2^2124521021 is an apocalyptic number.

It is an amenable number.

2124521021 is a deficient number, since it is larger than the sum of its proper divisors (303858499).

2124521021 is an equidigital number, since it uses as much as digits as its factorization.

2124521021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44443.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 2124521021 is about 46092.5267369885. The cubic root of 2124521021 is about 1285.5441927855.

Adding to 2124521021 its reverse (1201254212), we get a palindrome (3325775233).

The spelling of 2124521021 in words is "two billion, one hundred twenty-four million, five hundred twenty-one thousand, twenty-one".