2115243021 has 8 divisors (see below), whose sum is σ = 2824712800. Its totient is φ = 1407967632.

The previous prime is 2115243019. The next prime is 2115243049. The reversal of 2115243021 is 1203425112.

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

It is not a de Polignac number, because 2115243021 - 2¹ = 2115243019 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2115243721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 546346 + ... + 550203.

It is an arithmetic number, because the mean of its divisors is an integer number (353089100).

Almost surely, 2^2115243021 is an apocalyptic number.

It is an amenable number.

2115243021 is a deficient number, since it is larger than the sum of its proper divisors (709469779).

2115243021 is a wasteful number, since it uses less digits than its factorization.

2115243021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1097195.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 2115243021 is about 45991.7712313844. The cubic root of 2115243021 is about 1283.6700944675.

Adding to 2115243021 its reverse (1203425112), we get a palindrome (3318668133).

The spelling of 2115243021 in words is "two billion, one hundred fifteen million, two hundred forty-three thousand, twenty-one".