2403520021 has 8 divisors (see below), whose sum is σ = 2802939200. Its totient is φ = 2060159724.

The previous prime is 2403520019. The next prime is 2403520127. The reversal of 2403520021 is 1200253042.

It is not a de Polignac number, because 2403520021 - 2¹ = 2403520019 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 (2403580021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3503331 + ... + 3504016.

It is an arithmetic number, because the mean of its divisors is an integer number (350367400).

Almost surely, 2^2403520021 is an apocalyptic number.

It is an amenable number.

2403520021 is a deficient number, since it is larger than the sum of its proper divisors (399419179).

2403520021 is an frugal number, since it uses more digits than its factorization.

2403520021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7007368 (or 7007354 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 2403520021 is about 49025.7077562374. The cubic root of 2403520021 is about 1339.5201409829.

Adding to 2403520021 its reverse (1200253042), we get a palindrome (3603773063).

The spelling of 2403520021 in words is "two billion, four hundred three million, five hundred twenty thousand, twenty-one".