2421510021 has 12 divisors (see below), whose sum is σ = 3997413472. Its totient is φ = 1383719976.

The previous prime is 2421510019. The next prime is 2421510053. The reversal of 2421510021 is 1200151242.

It is not a de Polignac number, because 2421510021 - 2¹ = 2421510019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2421509976 and 2421510003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2421510071) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19218271 + ... + 19218396.

Almost surely, 2^2421510021 is an apocalyptic number.

2421510021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2421510021 is a deficient number, since it is larger than the sum of its proper divisors (1575903451).

2421510021 is a wasteful number, since it uses less digits than its factorization.

2421510021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38436680 (or 38436677 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 2421510021 is about 49208.8408825081. The cubic root of 2421510021 is about 1342.8538754814.

Adding to 2421510021 its reverse (1200151242), we get a palindrome (3621661263).

The spelling of 2421510021 in words is "two billion, four hundred twenty-one million, five hundred ten thousand, twenty-one".