2490450021 has 12 divisors (see below), whose sum is σ = 3632935020. Its totient is φ = 1643860800.

The previous prime is 2490450013. The next prime is 2490450029. The reversal of 2490450021 is 1200540942.

It is an interprime number because it is at equal distance from previous prime (2490450013) and next prime (2490450029).

It can be written as a sum of positive squares in 2 ways, for example, as 1803276225 + 687173796 = 42465^2 + 26214^2 .

It is not a de Polignac number, because 2490450021 - 2³ = 2490450013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2490450029) 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, 1368976 + ... + 1370793.

It is an arithmetic number, because the mean of its divisors is an integer number (302744585).

Almost surely, 2^2490450021 is an apocalyptic number.

It is an amenable number.

2490450021 is a deficient number, since it is larger than the sum of its proper divisors (1142484999).

2490450021 is a wasteful number, since it uses less digits than its factorization.

2490450021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2739876 (or 2739873 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 2490450021 is about 49904.4088332885. The cubic root of 2490450021 is about 1355.4784276613.

Adding to 2490450021 its reverse (1200540942), we get a palindrome (3690990963).

The spelling of 2490450021 in words is "two billion, four hundred ninety million, four hundred fifty thousand, twenty-one".